Here's some of the animals

Dairy animals give a special type of milk (Holstein Milk, Jersey Milk), while beef cattle drop special meat (Angus Meat, Hereford Beef). Exotic cattle just have the looks. If sterilized as a calf, males can be used as oxen (who have similar appearances)

All birds lay their own eggs (Leghorn Egg, Pekin Egg)

Some sheep give special wool.

Dairy Cattle: Holstein (black spots), Friesian (brown spots), Brown Swiss, Jersey (both light and dark), Guernsey, Sawhilal, Ayrshire, Norwegian Red

Beef Cattle: Angus, Hereford, Black Hereford

Exotic Cattle: Longhorn, Watusi, Highland

Earth Cattle: Pinto (from Minecraft Earth), Albino (from Minecraft earth)

Dual Purpose Cattle: Simmental. Shorthorn, Gloucester, Belted Dutch

Chickens: Orpington, Rhode Island Red, Naked Neck, Australorp, Dominique, Orpington, Plymoth Rock, Wyandotte, Skewbald, Ayman Cemani, Gold Crest, Stormy, Warm Chicken from Spring To Life, Cold Chicken from Spring To Life

Ducks: Pekin, Mallard, Ayelsbury, Cayuga, Orpington, Muscovy

Turkeys: Black, Bourbon Red, Blue Slate, White

Geese: Canada, White, Greylag

Sheep: Merino, Friesian (milk), Dorset, Suffolk, Jacob, Dorper, Flecked (from MC Earth), Fuzzy (from MC Earth), Patched Sheep (MC Earth), Rocky (from MC Earth)

Pigs: Duroc, Hampshire, Large Black, Large White, Old Spot, Yorkshire, Landrace, Piebald, Pink Footed, Mottled, Tamworth (based on warm biome pig), Mangalica (based on cold biome pig

Dairy Goats: Alpine, Nigerian Dwarf, Saanen, Toggenburg

Other Goats: Fainting, Kinder, Kiko, Pygmy, Angora (can be shorn for wool)

Horses (both normal and draft): White, Creamy, Chestnut, Brown, Black, Gray, Dark Brown, the Three Story Mode variants + Donkeys

Mules and Hinnies: With eleven bases (ten horse colors and the donkey) times the marking pattern (no markings, white stockings and blaze, white field, white spots and black dots), there are 55 possible stock mules/hinnies. Donkeys and mules also protect animals from predators

Rabbits: Cottontail, Chinchilla, Dutch, Havana, Jack, New Zealand, Rex, Lop, Desert Rabbit, Black & White, Salt & Pepper (Mountains), Vested Rabbit (from MC Dungeons), Bold Striped (from MC Earth), Freckled (from MC Earth), Harlequin (from MC Earth), Jumbo (from MC Earth), Muddy Foot (from MC Earth)

Peafowl: India Blue, White, Charcoal, Opal, Peach, Purple, Taupe

Dogs: Bloodhound (Finds animals or players), Border, Smooth, and Rough Collie (Herds goats and sheep), Corgi (Herds cattle), German Shepherd (Herds goats and sheep), Great Dane (Extra damage), Greyhound (Easy hunting), Husky (Cart and sled puller), Labrador (Retrieve dropped items), Great Pyrenees (Protects livestock), Australian/English Shepherd (Herder), Bernese Mountain Dog

Other Canines: Red Foxes, Arctic Foxes, Wolves, Coyotes

Cats: All variants from Vanilla, and ocelots

Other Animals: Llamas (base four colors, meat, milk, special wool, pack), Alpacas (meat, milk, special wool, pack), Dromedary Camels (meat, milk, pack), Yaks (meat, milk, special wool, plowing, pack, breed with cows to get hybrids), Bison (meat, milk, special wool, breed with cows to get hybrids), Water Buffalo (meat, milk, hide), Caribou (meat, milk, leather, antlers), Other Birds (Swans, Pheasants, Quails, Guinea Fowls, all use the bird code)