Fish

Fish are cold-blooded vertebrates that breathe through gills and have scales. For them, swimming is an innate behavior. They reproduce sexually and internally. There are about 28,000 species, with some examples being clownfish (amphiprioninae) and goldfish (carassius auratus auratus).

Amphibians

Amphibians are cold-blooded vertebrates that thrive in land or on water. They have smooth, thin skin and 4 limbs. They undergo complete metamorphosis, the only vertebrates to do so. There are 7,274 species, some being the Rocky Mountain Tailed frog (Ascaphus montanus) and the Goliath Frog (Conraua goliath).