Birds found during FONT Tours 
for Grouse & Other Birds  

in Colorado & Western Kansas
(and nearby Wyoming, Nebraska, 
 & Oklahoma) 

2000 thru 2004

(during the month of April)

List compiled by Armas Hill 

There have been 5 such FONT birding tours.

226 species of birds have cumulatively been seen, 
along with 8 additional subspecies.

Codes:

co = Colorado
kn = Kansas
nb = Nebraska
ok = Oklahoma
wy = Wyoming

The following 3 codes apply to Colorado:
b = seen both east and west of the Rocky Mountain passes
e = seen in east only
w = seen in west only

h = heard only

(e):     endemic to the USA 
(qe):   quasi (or nearly) endemic to the USA
(neb): near-endemic breeder in the USA
(i):      species introduced into North America

(t): a globally threatened or rare species, designated by Birdlife International
(t1): critical   (t2): endangered   (t3): vulnerable
(nt): a near-threatened species globally

Photo Gallery with Colorado Birds (PG)

List of mammals follows the birds.

Birds:

1. Common Loon ______ 
   Gavia immer
2. Pied-billed Grebe ______ cob,wy
   Podilymbus p. podiceps
3. Eared Grebe ______ cob,wy  (In Europe called Black-necked Grebe)
   Podiceps nigricollis californicus
4. Western Grebe ______ cob,kn,wy
   Aechmophorus occidentalis
5. Clark's Grebe ______ coe
   Aechmophorus clarkii
6. American White Pelican ______ cob,wy
   Pelecanus erythrorhynchos
7. Double-crested Cormorant ______ cob,kn,wy
   Phalacrocorax auritus
8. Great Blue Heron ______ cob,kn,wy
   Ardea herodias 
9. Snowy Egret ______ coe
   Egretta thula
10. Cattle Egret ______ kn
    Bubulcus ibis
11. Green Heron ______ kn
    Butorides virescens
12. Black-crowned Night-Heron ______ coe,kn
    Nycticorax nycticorax
13. White-faced Ibis ______ cob,kn,wy
    Plegadis chihi
14. Mute Swan (i) ______
    Cygnus olor
15. Greater White-fronted Goose ______ coe
    Anser albifrons frontalis
16. Snow Goose ______ coe,kn
    Chen (formerly Anser) c. caerulescens (known as "Lesser Snow Goose") 
17. Ross' Goose ______
    Chen (formerly Anser) rossi
18. Canada Goose  ______ cob,kn,wy  (introduced subspecies of eastern NA)
    Branta canadensis 
19. Wood Duck ______ coe,kn
    Aix sponsa
20. Mallard ______ cob,kn,wy
    Anas p. platyrhynchos
21. Northern Pintail ______ cow,kn,wy
    Anas acuta
22. Blue-winged Teal ______ cob,kn,wy
    Anas discors
23. Cinnamon Teal ______ cob,wy
    Anas cyanoptera septentrionalium
24. American Green-winged Teal ______ cob,kn,wy  (now considered a species distinct from the Eurasian Green-winged Teal, Anas crecca)
    Anas carolinensis
25. Northern Shoveler ______ cob,kn,wy
    Anas clypeata
26. Gadwall ______ cob,kn,wy
    Anas s. strepera
27. American Wigeon ______ cob,wy
    Anas americana
28. Canvasback ______ cob,wy
    Aythya valisineria
29. Redhead ______ cob,wy
    Aythya americana
30. Ring-necked Duck ______ cow,wy
    Aythya collaris
31. Lesser Scaup ______ cob,kn,wy
    Aythya affinis
32. Common Goldeneye ______ cob
    Bucephala clangula americana
33. Barrow's Goldeneye ______ cow
    Bucephala islandica
34. Bufflehead ______ cob,kn,wy
    Bucephala albeola
35. Common Merganser ______ cob,wy
    Mergus merganser americanus
36. Red-breasted Merganser ______ coe
    Mergus serrator 
37. Ruddy Duck ______ cob,kn
    Oxyura j. rubida  
38. Turkey Vulture ______ cob,kn,nb
    Cathartes aura meridionalis
39. Osprey ______ cob
    Pandion haliaetus carolinensis
40. Bald (Fish-) Eagle ______ cow,wy  PG
    Haliaeetus leucocephalus (washingtoniensis)
41. Northern (or North American) Harrier ______ cob,kn,wy  (formerly conspecific with Hen Harrier of Eurasia, Circus cyaneus)
    Circus hudsonius 
42. Sharp-shinned Hawk ______ cob,kn
    Accipiter striatus velox
43. Cooper's Hawk ______ cob,nb
    Accipiter cooperi
44. Northern Goshawk ______ cow
    Accipiter gentilis atricapillus
45. Broad-winged Hawk ______ (rare in CO) coe
    Buteo platypterus platypterus
46. Swainson's Hawk ______ cob,kn,nb,wy
    Buteo swainsoni
47. Red-tailed Hawk ______ cob,kn,nb,wy
    Buteo jamaicensis calurus
48. "Harlan's Hawk" ______ cow  (a subspecies of the Red-tailed Hawk)
    Buteo jamaicensis harlani
49. Ferruginous Hawk (nt) ______ coe,kn
    Buteo regalis
50. Rough-legged Hawk ______ cob
    Buteo lagopus sanctijohannis
51. Golden Eagle ______ cob,wy
    Aquila chrysaetos canadensis
52. American Kestrel ______ cob,kn,nb,wy
    Falco sparverius sparverius
53. Merlin ______  coe
    Falco columbarius richardsoni
54. Prairie Falcon ______ cob,kn
    Falco mexicanus
55. Peregrine Falcon ______ cow
    Falco peregrinus 
56. Chukar (i) ______ cow
    Alectoris chukar
57. Common/Ring-necked Pheasant (i) ______ coe,kn
    Phasianus colchicus
58. Blue Grouse ______ cow  PG
    Dendragapus obscurus richardsonii (this subspecies also called "Dusky Grouse")
59. White-tailed Ptarmigan ______ cow  PG
    Lagopus leucurus
60. Greater Sage-Grouse (qe) ______ cow
    Centrocercus urophasianus
61. Gunnison Sage-Grouse (t2) (e) ______ cow  (nearly endemic to Colorado, with a very few in adjacent Utah) 
    Centrocercus minimus
62. Greater Prairie-Chicken (e) ______ coe  PG
    Tympanuchus cupido
63. Lesser Prairie-Chicken (t3) (e) ______ kn
    Tympanuchus pallidcinctus
64. Sharp-tailed Grouse ______ cow
    Tympanuchus phasianellus
65. Wild Turkey ______ coe,kn, nb  (introduced population)
    Meleagris gallopavo
66. Northern Bobwhite ______ coe,kn
    Colinus virginianus
67. Scaled Quail ______ coe
    Callipepla squamata
68. American Coot ______ cob,kn,wy
    Fulica americana
69. Sandhill Crane ______ cow
    Grus canadensis tabida
70. Semipalmated Plover ______
    Charadrius semipalmatus
71. Snowy Plover ______ coe (considered conspecific with Kentish Plover of the Old World)
    Charadrius alexandrinus nivosus 
72. Killdeer ______ cob,kn,ok,wy
    Charadrius vociferus
73. Mountain Plover (t3) (neb) ______ coe,kn  PG
    Charadrius montanus
74. Black-necked Stilt ______ cob
    Himantopus mexicanus
75. American Avocet ______ cob,kn
    Recurvirostra americana
76. Greater Yellowlegs ______ cob,kn
    Tringa melanoleuca
77. Lesser Yellowlegs ______ cob,kn
    Tringa flavipes
78. Solitary Sandpiper ______ cow,kn
    Tringa solitaria
79. Spotted Sandpiper ______ coe,kn
    Actitis macularia 
80. Willet ______ cob
    Catoptrophorus semipalmatus inornatus
81. Long-billed Curlew (nt) ______ cob,kn
    Numenius americanus
82. Marbled Godwit ______ cob
    Limosa fedoa
83. Semipalmated Sandpiper ______
    Calidris pusilla
84. Western Sandpiper ______ coe
    Calidris mauri
85. Least Sandpiper ______ coe
    Calidris minutilla
86. Baird's Sandpiper ______ coe,kn
    Calidris bairdii
87. Pectoral Sandpiper ______
    Calidris melanotos
88. Long-billed Dowitcher ______ cob
    Limnodromus scolopaceus
89. Wilson's Snipe ______ cob,kn  (has been considered part of the Common Snipe of the Palearctic, Gallinago gallinago) 
    Gallinago delicata
90. Wilson's Phalarope ______ cob,kn
    Phalaropus tricolor
91. Franklin's Gull ______ cob,kn,wy
    Larus pipixcan
92. Bonaparte's Gull ______ cob,kn
    Larus philadelphia
93. Ring-billed Gull ______ cob
    Larus delawarensis
94. California Gull ______ cow,wy
    Larus californicus
95. American Herring Gull ______ coe
    Larus (argentatus) smithsonianus
96. Forster's Tern ______ coe
    Sterna forsteri
97. Feral Pigeon (i) ______ cob,kn,wy
    Columba livia
98. Mourning Dove ______ cob,kn,nb,ok,wy
    Zenaida macroura
99. Eurasian Collared-Dove (i) ______ coe,kn,nb
    Streptopelia decaocto
100. Great Horned Owl ______ coe,kn
     Bubo v. virginianus
101. Burrowing Owl ______ coe,kn,nb
     Athene cunicularia hypugaea
102. Common Nighthawk ______
     Chordeiles minor
103. White-throated Swift ______ cow 
     Aeronautes saxatalis
104. Black-chinned Hummingbird ______ coe
     Archilochus alexandri
105. Broad-tailed Hummingbird ______ coe
     Selasphorus platycercus
106. Belted Kingfisher ______ cob,kn,nb,wy
     Ceryle alcyon
107. Lewis' Woodpecker ______ coe
     Melanerpes lewis
108. Red-bellied Woodpecker ______ coe
     Melanerpes carolinus
109. Red-naped Sapsucker ______ cow
     Sphyrapicus nuchalis
110. Williamson's Sapsucker ______ cow
     Sphyrapicus thyroideus nataliae
111. Ladder-backed Woodpecker ______ coe
     Picoides scalaris cactophilus
112. Downy Woodpecker ______ cob,kn
     Picoides pubescens leucurus
113. Hairy Woodpecker ______ cow
     Picoides villosus septentrionalis
114. Northern Flicker ______ (both "Yellow-shafted" & "Red-shafted") cob
     Colaptes auratus auratus ("Yellow-shafted") coe,kn
     Colaptes auratus cafer ("Red-shafted") cow,wy
115. Dusky Flycatcher ______ kn
     Empidonax oberholseri
116. Gray Flycatcher ______ cow
     Empidonax wrightii
117. Eastern Phoebe ______ coe,kn
     Sayornis phoebe
118. Say's Phoebe ______ cob,kn
     Sayornis saya
119. Vermilion Flycatcher ______ (rare in CO) coe
     Pyrocephalus rubinus
120. Ash-throated Flycatcher ______ cob
     Myarchus cinerascens
121. Cassin's Kingbird ______ cob
     Tyrannus vociferans
122. Western Kingbird ______ cob,kn
     Tyrannus verticalis
123. Loggerhead Shrike ______ cob,kn,ok
     Lanius ludovicianus
124. Gray Jay ______ cow
     Perisoreus canadensis capitalis
125. Steller's Jay ______ cob
     Cyanocitta stelleri macrolopha
126. Blue Jay ______ coe,nb
     Cyanocitta cristata cyanotephra
127. Western Scrub-Jay ______ cob
     Aphelocoma californica woodhouseii
128. Pinyon Jay ______ cow
     Gymnorhinus cyanocephalus
129. Clark's Nutcracker ______ cow
     Nucifraga columbiana
130. Black-billed/American Magpie ______ cob,kn,wy (formerly conspecific with Common Magpie of Eurasia, Pica pica)
     Pica hudsonia
131. American Crow ______ cob,kn,nb,wy
     Corvus brachyrhynchos hesperis
132. Chihuahuan Raven ______ coe,kn
     Corvus cryptoleucus
133. Common Raven ______ cob,wy
     Corvus corax principalis
134. Horned Lark ______ cob,kn,nb,ok,wy
     Eremophila alpestris
135. Tree Swallow ______ cob,kn
     Tachycineta bicolor
136. Violet-green Swallow ______ cow
     Tachycineta thalassina lepida
137. Northern Rough-winged Swallow ______ cob,kn
     Stelgidopteryx serripennis
138. Bank Swallow ______ cow (in Old World called Sand Martin)
     Riparia r. riparia
139. Cliff Swallow ______ coe,kn
     Petrochelidon p. pyrrhonota
140. Barn Swallow ______ cob,kn,nb,ok
     Hirundo rustica erythrogaster
141. Juniper Titmouse ______ cow
     Parus r. ridgwayi 
142. Black-capped Chickadee ______ cob,kn,wy
     Poecile atricapilla septentrionalis
143. Mountain Chickadee ______ cob,wy
     Poecile g. gambeli
144. (Common) Bushtit ______ cow
     Psaltriparus minimus plumbeus  (the "Lead-colored Bushtit") 
145. Red-breasted Nuthatch ______ cob,wy
     Sitta canadensis
146. White-breasted Nuthatch ______ cob,kn,wy
     Sitta carolinensis nelsoni
147. Pygmy Nuthatch ______ cob
     Sitta pygmaea melanotis
148. Brown Creeper ______ cow
     Certhia americana montana
149. Rock Wren ______ cob
     Salpinctes obsoletus
150. Canyon Wren ______ cob
     Catherpes mexicanus
151. Bewick's Wren ______ coe,kn
     Thryomanes bewickii cryptus 
152. House Wren ______ cow
     Troglodytes aedon parkmani
153. Winter Wren ______ cow
     Troglodytes troglodytes pacificus
154. Marsh Wren ______ cow
     Cistothorus palustris laingi
155. American Dipper ______ cob
     Cinclus mexicanus unicolor
156. Ruby-crowned Kinglet ______ cob
     Regulus calendula
157. Golden-crowned Kinglet ______ cow
     Regulus satrapa
158. Blue-gray Gnatcatcher ______ cob
     Polioptila caerulea
159. Eastern Bluebird ______ coe,kn
     Sialia s. sialis
160. Western Bluebird ______ cob
     Sialia mexicana occidentalis
161. Mountain Bluebird ______ cob,wy
     Sialia currucoides
162. Townsend's Solitaire ______ cob
     Myadestes townsendi
163. Hermit Thrush ______ cow
     Catharus guttatus auduboni
164. American Robin ______ cob,kn,nb,wy
     Turdus migratorius
165. Gray Catbird ______ cow
     Dumetella carolinensis
166. Northern Mockingbird ______ coe,kn
     Mimus p. polyglottos
167. Brown Thrasher ______ coe
     Toxostoma rufum longicauda 
168. Sage Thrasher ______ cow,wy
     Oreoscoptes montanus
169. European Starling (i) ______ cob,kn,nb,ok,wy
     Sturnus vulgaris
170. American Pipit ______ cob,wy  (an alternate name is Buff-bellied Pipit)
     Anthus rubescens  
171. Cedar Waxwing ______ cow
     Bombycilla cedrorum
172. Worm-eating Warbler ______ coe  (rare in Colorado)
     Helmitheros vermivorum 
173. Northern Parula ______ coe  (rare in Colorado)
     Parula americana
174. Orange-crowned Warbler ______ cow,kn
     Vermivora celata orestera
175. Virginia's Warbler ______ cow
     Vermivora virginiae
176. Yellow-rumped (Myrtle) Warbler ______ coe,kn
     Dendroica coronata
177. Yellow-rumped (Audubon's) Warbler ______ cob,kn
     Dendroica coronata
178. Black-throated Gray Warbler ______ cow
     Dendroica nigrescens 
179. Wilson's Warbler ______ coe,kn
     Wilsonia canadensis
180. Northern Cardinal ______ coe
     Cardinalis cardinalis canicaudus
181. Green-tailed Towhee ______ cow
     Pipilo chlorurus
182. Spotted Towhee ______ cob
     Pipilo maculatus montanus
183. Canyon Towhee ______ coe
     Pipilo fuscus
184. Cassin's Sparrow ______ coe
     Aimophila cassinii
185. American Tree Sparrow ______ coe
     Spizella arborea
186. Chipping Sparrow ______ cob,kn,nb
     Spizella passerina
187. Clay-colored Sparrow ______ coe
     Spizella pallida
188. Brewer's Sparrow ______ cob
     Spizella breweri breweri  (subspecies valid as long as "Timberline Sparrow" of Canada considered conspecific) 
189. Vesper Sparrow ______ cob,kn,nb,ok,wy
     Pooecetes gramineus confinis
190. Lark Sparrow ______ cob,kn
     Chondestes grammacus
191. Sage Sparrow ______ cow
     Amphispiza belli nevadensis
192. Lark Bunting ______ coe,kn
     Calamospiza  melanocorys
193. Savannah Sparrow ______ cob,wy
     Passerculus sandwichensis
194. Grasshopper Sparrow ______ coe,kn
     Ammodramus savannarum
195. "Slate-colored" Fox Sparrow ______ cow
     Passerella iliaca schistacea
196. Song Sparrow ______ cob,kn
     Melospiza melodia
197. Lincoln's Sparrow ______ coe
     Melospiza melodia
198. White-throated Sparrow ______ (rare in CO) coe
     Zonotrichia albicollis
199. White-crowned Sparrow ______ cob,kn
     Zonotrichia leucophrys
200. Harris's Sparrow ______ coe
     Zonotrichia querula
201. Dark-eyed ("White-winged") Junco ______ cow
     Junco hyemalis aikeni
202. Dark-eyed ("Oregon") Junco ______ cob
     Junco hyemalis
203. Dark-eyed ("Pink-sided") Junco ______ cow,wy
     Junco hyemalis aikeni
204. Dark-eyed ("Gray-headed") Junco ______ cob,wy
     Junco hyemalis caniceps
205. Dark-eyed ("Slate-colored") Junco ______ cob,wy
     Junco hyemalis
206. McCown's Longspur ______ coe,wy
     Calcarius mccownii
207. Chestnut-collared Longspur ______ coe
     Calcarius ornatus
208. Western Meadowlark ______ cob,kn,nb,ok,wy
     Sturnella neglecta
209. Red-winged Blackbird ______ cob,kn,nb,ok,wy
     Agelaius phoeniceus
210. Yellow-headed Blackbird ______ cob,kn,wy
     Xanthocephalus xanthocephalus
211. Brewer's Blackbird ______ cob,kn,nb,wy
     Euphagus cyanocephalus
212. Great-tailed Grackle ______ coe,kn,ok
     Quiscalus mexicanus
213. Common Grackle ______ cob,kn,nb,ok,wy
     Quiscalus quiscula
214. Brown-headed Cowbird ______ cob,kn
     Molothrus ater
215. Orchard Oriole ______ coe
     Icterus spurius
216. Gray-crowned (including "Hepburn's") Rosy Finch ______ cob
     Leucosticte tephrocotis 
     Leucosticte t. littoralis ("Hepburn's Rosy Finch")
217. Black Rosy Finch (e) ______ cob
     Leucosticte atrata
218. Brown-capped Rosy Finch (e) ______ cob  (this species nearly endemic to Colorado, particularly as a breeder)
     Leucosticte australis
219. Pine Grosbeak ______ cob,wy
     Pinicola enucleator
220. Cassin's Finch ______ cob,wy
     Carpodacus cassinii
221. House Finch ______ cob,kn,nb
     Carpodacus mexicanus
222. Red Crossbill ______ cob,wy
     Loxia curvirostra
223. Pine Siskin ______ cob,kn,wy
     Carduelis pinus
224. American Goldfinch ______ cob,kn,nb
     Carduelis tristis
225. Evening Grosbeak ______ cob,wy
     Coccothraustes vespertinus
226. House Sparrow (i) ______ cob,kn,nb,ok,wy
     Passer domesticus

Notes:

The Gunnison Sage-Grouse is a newly-described species of the USA heartland. It is very localized with a range restricted to southwest Colorado and southeast Utah. It's thought to have formerly been more widespread (possibly in New Mexico, eastern Arizona, southwest Kansas, and Oklahoma).
Now the bird occurs in 6 or 7 counties of southwest Colorado and a single county in adjacent southeast Utah. The entire population is estimated at being less than 5,000 birds, with most (2,500-3,000) in the Gunnison Basin (of Colorado). Elsewhere populations number less than 300, with fewer than 150 in Utah.
It has disappeared from several population pockets since 1980, with an overall decline of over 60% in males attending breeding leks in the Gunnison Basin in the last 50 years.
Formerly considered a subspecies of the more-northerly Sage Grouse (now Greater Sage-Grouse),  Gunnison Sage-Grouse of both sexes have  plumages similar to that species, but are about 30% smaller. 

There are 3 species in the "Prairie Chicken Group": the Greater Prairie Chicken, the Lesser Prairie Chicken, and the Sharp-tailed Grouse.  

There have historically been 3 subspecies of Greater Prairie Chickens. 
In the eastern United States, the subspecies T.c. cupido, called the "Heath Hen", occurred formerly in bushy habitat from Boston south to Washington. It was extirpated on the mainland about 1835. It continued to survive beyond that on the Massachusetts offshore island of Martha's Vineyard until it was last reported there in 1932. At that time, the eastern race of the Greater Prairie Chicken became extinct.
Another race of the species, in coastal Texas, is now very rare. T.c. attwateri, the "Attwater's Prairie Chicken" has declined in 30 years from 8,700 individuals in 1937 to 1,070 in 1967. After another 30 years, in 1998, only 56 individuals remained in 3 isolated populations. Even with released captive-reared birds, that subspecies is severely threatened.
The most wide-ranging of the Greater Prairie Chicken subspecies (and the one occurring in eastern Colorado), T.c. pinnatus, has declined over much of its range. The population in the late 1970's was estimated as 500,000. Due to its being in small isolated populations, the species overall is at considerable risk.

Greater Prairie Chickens at their lek at dawn.

The Lesser Prairie Chicken has declined substantially since the European settlement of the Great Plains. That decline is thought to be over 90% since the 19th Century, and nearly 80% since the early 1960's. 
In 1980, Lesser Prairie Chickens occupied only 8% of their original range (which was historically throughout the southwest Great Plains, in southeast Colorado, southwest Kansas, western Oklahoma, northern Texas, and eastern New Mexico). Now, it is only in small, scattered populations.
The population estimate was about 50,000 birds in about 1980 (from 42,000 to 55,000 in 1979). 20 years later, in 1999, the population was estimated as 10,000 to 25,000, mostly in northwest Texas and Kansas.      

There are 5 subspecies of Sharp-tailed Grouse. It now occurs in less than half of its original range in 9 U.S. states. It is now extinct in 8 U.S. states where it formerly occurred. In the northern part of its range (in Canada), it is fairly common. 

A good source for information (such as that above) about the grouse is the book: "Pheasants, Partridges, and Grouse" by Steve Madge and Phil McGowan, 
published in 2002 by Princeton Univ Press.  

Mammals found during FONT Tours 

in Colorado
 
(and nearby Kansas, Wyoming, 
Nebraska, & Oklahoma) 

1993 thru 2004

(during the month of April)

List compiled by Armas Hill 

1. Red Fox ______ co
   Vulpes fulva  (the North American animal has been considered by some as conspecific with the Old World Red Fox, Vulpes vulpes)  
2. Gray Fox ______ co
   Urocyon cinereoargenteus
3. Coyote ______ co,kn
   Canis latrans
4. American Badger ______ co
   Taxidea taxus
5. Yellow-bellied Marmot ______ co
   Marmota flaviventris
6. Northern Raccoon ______ co
   Procyon lotor
7. Blacktail Prairie Dog ______  co,kn,nb
   Cynomys ludovicianus 
8. Whitetail Prairie Dog ______ co
   Cynomys leucurus 
9. Thirteen-lined Ground-Squirrel ______ co,wy
   Spermophilus tridecemlineatus
10. Wyoming Ground Squirrel (formerly conspecific with Richardson's Ground Squirrel, Spermophilus richardsonii)  ______ co,wy
    Spermophilus elegans
11. Rock Squirrel ______ co
    Spermophilus variegatus
12. Golden-mantled Ground Squirrel ______ co
    Spermophilus lateralis
13. Red Squirrel  ______ co  (also called Chickaree)
    Tamiasciurus hudsonicus
14. Least Chipmunk ______ co
    Tamias minimus
15. Eastern Fox Squirrel (northern form) ______ co,nb
    Sciurus niger
16. Olive-backed Pocket Mouse ______ co
    Perognathus fasciatus
17. Plains Pocket Mouse ______ kn
    Perognathus flavescens
18. Plains Harvest Mouse ______ coe
    Reithrodontomys montanus
19. North American Porcupine ______ co
    Erethizon dorsatum
20. American Beaver ______ co,wy
    Castor canadensis 
21. Muskrat ______ co,wy
    Ondatra zibethica
22. Snowshoe/Varying Hare ______ co,wy
    Lepus americanus
23. Blacktail Jackrabbit ______ kn
    Lepus californicus
24. Whitetail Jackrabbit ______ co,kn
    Lepus townsendii
25. Desert Cottontail ______ co
    Sylvilagus audubonii
26. Mountain Cottontail ______ co,wy
    Sylvilagus nuttallii
27. Eastern Cottontail ______ co,kn
    Sylvilagus floridanus
28. Elk (or Wapiti) ______ co,wy
    Cervus elaphus canadensis (another, slightly smaller, subspecies in Europe is called there the Red Deer)
29. Moose ______ co  (in Europe called Elk)
    Alces alces
30. Pronghorn ______ co,kn,wy
    Antilocapra americana
31. Mule/Blacktail Deer ______ co,kn,wy
    Odocoileus hemionus
32. Whitetail Deer ______ kn
    Odocoileus virginianus
33. Bighorn Sheep ______ co
    Ovis c. canadensis  (the subspecies of the central and northern Rockies)
34. (Plains) Bison (or Buffalo) ______ co  (today domesticated, the last wild Bison in Colorado was killed in 1889, in eastern CO)
    Bison b. bison
    

Notes:

Coyotes have expanded east across North America in the mid-1900's of wolves. Generally those in eastern North America tend to be larger than those in the American West. Those in the northern part of their range have longer and coarser fur. Coyotes travel in packs.   

The Bison (or Buffalo) is North America's largest present-day land mammal. It was, with the European settlement of America, nearly hunted to extinction. There were probably fewer than 1,000 animals remaining at the end of the 19th Century. The species "recovered" to about 150,000 animals by 1995, with 90% privately owned. They typically graze now in herds of 4 to 20.  

Reference for this mammal list is the new book: "Mammals of North America" by Roland W. Kays & Don E. Wilson, published by Princeton Univ Press, 2002.