What double letter animals are there?

animals with double letters: * kitten * puppy * otter * poodle * butterfly * eel * gorilla * mammoth * terrier (dog breed) * grizzly bear * buzzard * deer * moose * squirrel * krill (type of fish) * alligator * collie (dog breed) * bass (fish) * baboon * raccoon * hippo * ferret * rabbit * bunny * bee * beetle * goose * chimpanzee * chickadee * leech * opossum * guppy * rooster * jelly fish * meerkat * cheetah * giraffe * kangaroo * wallaby * gazelle