| 1a. |
Adult with long tail, aquatic larvae with conspicuous gills on sides of head. |
Ambystoma tigrinum,
Tiger salamander |
| 1b. |
Adult lacking tail. |
(2)
Frogs and Toads |
| |
| 2a. |
Skin warty, prominent parotoid glands behind eyes. |
(3) |
| 2b. |
Skin relatively smooth, no parotoid glands. |
(7) |
| |
| 3a. |
Light mid-dorsal stripe. |
(4) |
| 3b. |
No light mid-dorsal stripe. |
(6) |
| |
| 4a. |
Large symmetrical dark blotches on back. |
Bufo cognatus,
Great Plains toad |
| 4b. |
Not as above. |
(5) |
| |
| 5a. |
No cranial crests, usually above 8,000'. |
Bufo boreas,
Boreal toad |
| 5b. |
Cranial crests, usually below 7,000'. |
Bufo woodhousii,
Woodhouse's toad |
| |
| 6a. |
Parotoid glands nearly circular, body tan or gray with red warts. |
Bufo punctatus,
Red-spotted toad |
| 6b. |
Body green with scattered dark spots. |
Bufo debilis,
Green toad |
| |
| 7a. |
Head small with fold of skin behind eyes. |
Gastrophryne olivacea,
Great Plains
narrowmouth toad |
| 7b. |
Not as above. |
(8) |
| |
| 8a. |
Vertical pupils; rear feet each with single, hard dark 'spade'. |
(9) |
| 8b. |
Pupils and rear feet not as above. |
(12) |
| |
| 9a. |
Boss between eyes. |
(10) |
| 9b. |
No boss between eyes. |
(11) |
| |
| 10a. |
Boss hard, mostly eastern Colorado. |
Spea bombifrons,
Plains spadefoot |
| 10b. |
Boss pliable, western Colorado. |
Spea intermontana,
Great Basin spadefoot |
| |
| 11a. |
Body greenish-yellow with dark blotches; snout-vent length may exceed 2.5 inches. |
Scaphiopus couchii,
Couch's spadefoot |
| 11b. |
Body gray or brown with dark spots; snout-vent length up to 2.5 inches. |
Spea multiplicata,
New Mexico spadefoot |
| |
| 12a. |
Conspicuous dorsolateral folds. |
(13) |
| 12b. |
No dorsolateral folds. |
(15) |
| |
| 13a. |
Dark mask through eye from snout to angle of jaw, usually light mid-dorsal stripe, north-central Colo. |
Rana sylvatica,
Wood frog |
| 13b. |
No mid-dorsal stripe, dark spots on body. |
(14) |
| |
| 14a. |
Dorsolateral folds continuous from eye to groin, body green or brown. |
Rana pipiens,
Northern leopard frog |
| 14b. |
Dorsolateral folds broken and inset near groin, body always brown. |
Rana blairi,
Plains leopard frog |
| |
| 15a. |
Toepads distinctly enlarged. |
Hyla arenicolor,
Canyon treefrog |
| 15b. |
Not as above. |
(16) |
| |
| 16a. |
Fold of skin around top of eardrum; body size may exceed 7 inches. |
Rana catesbeiana,
Bullfrog |
| 16b. |
Maximum body size less than 1.5 inches. |
(17) |
| |
| 17a. |
Stripe through eye from snout to groin, usually three stripes on back (may be spotted), little webbing on hind feet. |
Pseudacris triseriata
complex,
Chorus frog |
| 17b. |
Triangular spot between eyes, extensive webbing on hind feet. |
Acris crepitans,
Northern cricket frog |
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