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Quick Key to Amphibians and Reptiles of Colorado

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Quick Key to Amphibians and Reptiles of Colorado COLORADO PARKS & WILDLIFE Quick Key to Amphibians and Reptiles of Colorado cpw.state.co.us Colorado is home to more than 70 amphibian and reptile species. This Quick Key was developed to help you identify these diverse animals. No matter where you are in the state, in the city, near a pond, even enjoying the view from over 12,000 feet, you likely are sharing that space with an amphibian or reptile. The current distribution, abundance, and population trends of many salamander, frog, toad, turtle, lizard, and snake species in Colorado are poorly known. Some species appear to be declining, but there isn’t enough information to determine whether the decline is cause for alarm or simply a natural fluctuation. Beginning with the first pair of To learn more about these interesting animals, statements, choose the statement check out the Colorado Parks & Wildlife (CPW) that best matches your website, which has additional photographs, species specimen. Follow the red descriptions, sound files of species calls, and line to the next pair ecological information. of statements. Continue to choose How do I use this key? the description that This key contains paired statements describing most closely matches the animal until you reach a adult reptiles and amphibians. Drawings highlight species name and photo. You can confirm your important identifying characteristics to look for on identification using the CPW website. If you find an the animal. Composite drawings combine the animal that doesn’t fit any description found in this features of several animals. key, it may be introduced to the state, an exotic, non-native species or even a juvenile or color variant of a native species. If possible, take a picture of the animal to submit to CPW for identification. Photos in the key that are depicted with orange borders and species names have not been seen in Colorado for decades. If you find one of these animals, report your observation immediately and document the location and identification of the animal with photographs. 1 ILLUSTRATIONS © MARJORIE LEGGITT Quick Key to 2 AMPHIBIANSAMPHIBIANS andand REPTILESREPTILES ofof ColoradoColorado or Skin often smooth and slick, sometimes rough or warty— - - - - - - - - - - - - - - - or - - - - - - - - - - - - - - - Skin scaly, toes (if present) clawed toes, if present, are not clawed *The same species may have more than one common name. Body covered by a shell Alternate common names are provided Body not covered by a shell (See Quick Key to Turtles Tail absent on adults, hind limbs of Colorado, page 3) Tail present; hind limbs not greatly in parentheses for much longer than forelimbs; eyes some species. larger than forelimbs; eyes small; usually large and protruding; no Top of vertical grooves along sides of vertical grooves along sides of body Limbs present Snake Head body; color pattern spotted, Limbs absent (See Quick Key to Frogs and (See Quick Key to Lizards blotched, mottled or unicolor Toads of Colorado, page 4) of Colorado, page 6) Barred Tiger Salamander (Adult) Eye Eye Rattle present at end of tail Venomous Snakes of Colorado No rattle present Large Scales Rattle (See Quick Key to Non-venomous Snakes of Colorado, page 10) Numerous small scales on top of head Numerous Small Scales Barred Tiger Salamander Head covered by large (Larva) scales, maximum total length about 2 feet Color reddish, maximum Massasauga total length about 2 feet, Color variable, maximum Western slope only total length about 4 feet Western Rattlesnake Prairie Rattlesnake (Midget Faded Rattlesnake)* Key adapted from Lauren Livo’s Keys to Amphibians and Reptiles of Colorado. Photos by Lauren Livo and Steve Wilcox Key illustrations by Helen Zane Jensen Quick Key to TURTLESTURTLES ofof ColoradoColorado or Carapace (upper shell) hard, covered by rigid, horny plates, - - - - - - - - - - - - - - - or - - - - - - - - - - - - - - - Carapace flat and leathery, with row of raised tubercles five claws on forefeet (bumps) on leading edge, three claws on forefeet, elongated snout Spiny Softshell Turtle Upper shell green or brown, Raised tubercles (bumps) High domed upper shell with many with few or no yellow markings conspicuous yellow lines against Elongated snout a dark background, plastron (lower shell) with distinct hinge, Carapace mostly green, head primarily found on land (terrestrial) with yellow or orange streaks Ornate Box Turtle Carapace mostly brownish: no yellow streaks on head Narrow yellow streaks on head, no indentation in carapace (upper shell) behind head, rear carapace smooth, Double-hinged Plastron Composite Turtle and plastron (lower shell) bright red Front Painted Turtle hinge Yellow line down middle of back Large red blotch behind each eye in addition to yellow streaks on head, indention in Painted upper shell behind head, large dark spots Turtle on plastron (lower shell), rear of upper shell Ornate jagged, no notch in upper jaw NON-NATIVE Box Turtle Pond Slider Rear Yellow hinge Mud Turtle Carapace lacking saw-toothed rear Snapping margin, plastron double-hinged Carapace with saw-toothed rear margin, Turtle Yellow Mud Turtle plastron small and lacking hinge Snapping Turtle Conspicuous radiating Rear yellow lines margin smooth 3 Saw-toothed rear margin Key adapted from Lauren Livo’s Keys to Amphibians and Reptiles of Colorado. Photos by Lauren Livo and Steve Wilcox Key illustrations by Helen Zane Jensen Quick Key to 4 FROGSFROGS andand TOADSTOADS ofof ColoradoColorado or Skin warty, large lumpy parotoid glands behind eyes - - - - - - - - - - - - - - - or - - - - - - - - - - - - - - - Skin relatively smooth, no parotoid glands Head small with fold of skin behind eyes No light stripe down middle of back Light stripe down middle of back Western Narrow-mouthed Toad No fold of skin behind eyes Large symmetrical dark blotches on back No large symmetrical dark blotches on back Great Plains Toad Vertical pupils; rear feet each with single, hard dark “spade” No cranial crests, usually found above 8,000' Boss (large lump) between eyes Boreal Toad Pupils not vertical Cranial crests, usually No boss (lump) found below 7,000' between eyes Boss hard, mostly Woodhouse’s Toad eastern Colorado Boss pliable, Plains Spadefoot western Colorado Great Basin Spadefoot Parotoid glands nearly circular, Parotoid glands large and triangular, body tan or gray with red warts body green with scattered dark spots Red-spotted Toad Green Toad Body greenish-yellow with dark blotches; spade on rear foot elongated; Body gray or brown with dark spots; body length may exceed 2.5 inches spade on rear foot about as broad as Couch’s Spadefoot it is long; body length up to 2.5 inches Mexican Spadefoot Conspicuous dorsolateral folds No folds down the sides of the back (folds along the sides of the back) (dorsolateral folds) Dark mask through eye from snout to angle of jaw, usually light mid-dorsal stripe, found in north-central Colorado Wood Frog Dark spots on body, Toepads distinctly enlarged no mid-dorsal stripe Toepads not enlarged Canyon Treefrog Dorsolateral folds broken and inset near groin, body tan or brown Fold of skin around top Plains Leopard Frog Dorsolateral folds continuous from of eardrum; body size eye to groin, body green or brown Northern Leopard Frog may exceed 7 inches Maximum body size less than 1.5 inches American Bullfrog Stripe through eye from snout Triangular spot between eyes, to groin, usually three stripes extensive webbing on hind feet on back (may be spotted), Blanchard’s Cricket Frog* little webbing on hind feet Dorsolateral folds Boreal Chorus Frog are folds of skin on A cranial crest is a ridge the sides of the back. that borders the middle A mid-dorsal stripe is a stripe and top side of the eye. down the middle of the back. Warts are bumps on the skin. A spade is a horny projection on the bottom of a spadefoot toad’s back foot. The spadefoot uses the spade to dig itself deep into the ground. Vertical pupil Tubercules (tubercles) are large bumps on the underside of the foot; toads often have two on each rear foot. A boss is a lump *Photos depicted with between the eyes. orange borders and species names have not been seen in Colorado for decades. Horizontal pupil Parotoid glands are found behind the eyes of toads and give off a toxic substance. Enlarged toepad 5 Eardrum Key adapted from Lauren Livo’s Keys to Amphibians and Reptiles of Colorado. Composite Frog/Toad Photos by Lauren Livo and Steve Wilcox Couch’s spadefoot toad photo by Charles Loeffler Key illustrations by Helen Zane Jensen Quick Key to 6 LIZARDSLIZARDS ofof ColoradoColorado or Horn-like spines on back of head No horn-like spines on back of head Short spines on back of head, no dark bars radiating from eyes Long spines on back of head, two rows of fringe scales on sides of body, dark bars radiating from eyes Texas Horned Lizard No fringe scales Single row of fringe on sides of body scales on sides of body, Round-tailed Horned Lizard Hernandez’s Short-horned Lizard Short spines on Scales variable, back of head but not very shiny Long spines on back of head Composite Hernandez’s Texas Horned Lizard Horned Lizard Short-horned Lizard Hernandez’s Scales on back Rear margin of Short-horned rounded and Round-tailed each scale on Lizard granular Horned back pointed Single row of Scales on back fringe scales Lizard Dark lines smooth and shiny with radiating rounded rear edges from eyes Two rows of fringe scales Continued from this point on page 8 Individual scales clearly black and Black wedge-shaped mark on side cream, total length to 13.75 inches of neck, up to
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