![]() ![]() The wood frog,įor example, ranges above the Arctic Circle. However, some Canadian species are more cold-tolerant and extend into the northern reaches of the country. Twenty-four species of frogs live in Canada climatic limitations restrict most species to the extreme southern portion of the country. ![]() Various adaptations permit frogs to exploit habitats ranging from rain forests to deserts andįrom the tropics to the Arctic Circle. Jurassic period deposits (201.3–145 million years old) in South America contain frogs that have a general body plan similar to some present-day species. Triadobatrachus, found in deposits from the Triassic period (251.9–201.3 million years old) in Madagascar, is the earliest knownįrog. Evolutionįrogs appear very early in the fossil record. However, some species, such as the wood frog, are able to survive freezing for extended periods of time. ![]() This is known as “behavioural thermoregulation.” Winter temperatures in northern temperate regions are too cold for continued activity or survival, so most frogs hibernate underwater or buried underground below the frost For example, amphibians can regulate their body temperature through behaviour and habitat use (e.g.,īy moving in and out of shade). Instead, their body temperature is governed by external conditions. To as toads are the Plains and Great Basin spadefoots (family Scaphiopodidae).Īmphibians are ectotherms, meaning that they do not generate their own body heat. In Canada, other frogs that are commonly referred Tadpoles have a tail with large fins and do not have legs in their early stages of development.įrogs belonging to the family Bufonidae, known as toads, generally have relatively drier skin and reduced webbing between their toes. Adult frogs have lungs and breathe air, whereas larvae, known as tadpoles, live in the water and breathe through gills. Some of the more aquatic species have well-developed webbing between their toes to assist YK, NWT, NU, BC, AB, SK, MB, ON, QC, NB, NS, PEI, NLĪdult frogs typically have longer hind limbs than forelimbs, well-developed eyes, and permeable skin with mucus and poison glands. BC, AB, NWT, SK, MB, ON, QC, NB, NS, PEI, NL ![]()
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