Mammals certainly are complicated, but I've always found birds and reptiles even more so because they have an astoundingly larger number of color morphs (at least it would seem when you try to write them all down!) in each species. I've made a mist of dog colors and then I tried to make a list of ball python colors and man it is a lot of work! And new morphs keep appearing all the time!

However, surprisingly, the different color and shape varieties are often similar from species to species. They are leus (birds, fish, mammals, reptiles), albinos (birds, fish, mammals, reptiles, invertebrates), pied, dilutes, merle, tortoiseshell, blaze, crests (that would be in birds), scaless/hairless/featherless, melanistic, erythristic, dwarfisim, ect.
However, I'm starting to get off subject. I just love animal genetics so much. : )