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NEXT UP: #5 seed Beaver (Rodentia: Castor canadensis) vs #12 seed Mink (Carnivora: Neovison vison) #2019MMM 
Rodents continue to impress with their adaptations. North American Beavers are the largest rodents in North America, with an average size of ~20 kg (90 stoats #stoatsasmeasurement). The only rodents larger than beavers, on average, are capybaras. Why are beavers so big? #2019MMM
Beavers may be big because of living in aquatic environments. Water is typically colder than mammalian body temperature & saps the heat from the body of a warm-blooded mammal. Larger size=more favorable surface area to volume ratio=less heat lost to the environment #2019MMM
