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Canadian Amphibian and Reptile Conservation Network - Réseau Canadien de 
Conservation des Amphibiens et des Reptiles

Step 2B

Key to Families of Anura (Frogs and Toads)

Choose the description that best fits the animal of interest.
If none fit go back to step one.

  • A.     vertical pupil, no external eardrum, males have external copulatory organ ("tail"), no dorsolateral ridges, British Columbia only
  • Leiopelmatidae (Tailed Frog Family) - formerly Ascaphidae

  • B.     vertical pupil, small external eardrum, many small warts but no large parotoid glands, one black horny 'spade' under edge of each hind foot, no dorsolateral ridges, Western Canada only
  • Scaphiopodidae (Spadefoot Family)

  • C.     squat, relatively short legs, pupil never vertical, external eardrum, rough warty skin, large parotoid glands, two hard projections on each hind foot, one larger than the other, no dorsolateral ridges
  • Bufonidae (Toad Family)

  • D.     small, slim-waist, relatively long legs, pupil never vertical, external eardrum, may have enlarged toe pads, no parotoid glands, no dorsolateral ridges, no larger than 6 cm body length
  • Hylidae (Treefrog Family)

  • E.     robust body, pupil never vertical, prominent external eardrum, no enlarged toe pads, no parotoid glands, well developed webs on hind feet, may have dorsolateral ridges
  • Ranidae (True Frog Family)