Tell me whether these are mammals or amphibians: rats, cats, dogs,  frogs, toads, salamanders, newts, caecilians, deer, monkeys, apes, bats, whales, dolphins, and humans.

rats are mammals.
cats are mammals
dogs are mammals
frogs are amphibians.
toads are amphibians.
salamanders are amphibians.
newts are amphibians.
caecilians are amphibians.
deer are mammals.
monkeys are mammals.
apes are mammals.
bats are mammals.
whales are mammals.
dolphins are mammals.
humans are mammals.