Whhhoooaaaaaa  - that hurt my brain - - but was fun.
A: Anteater; Armadillo; Aardvark, Arctic Fox, Antelope
B: Badger; Bison; Baboon, Beetle, Bear
C: Camel; Chinchilla ; Crayfish, Cat, Canine
D: Dinosaur; Duck; Dog, Dingo, Deer
E: Elephant; Elk; Eel, Emu, Eagle
F: Ferret; Flamingo; Frog, Flying Fish, Feline
G: Green Tree Frog; Geiko; Giraffe, Gerbil, Gorilla
H: Howling Monkey; Hyena; Horse, Hamster, Hippo
I: Iguanna; Ibis; Insect, Irish Setter, Ibex (wild goat)
J: Jack Rabbit; Jaguar; Jungle cat, Jackalope, Jellyfish
K: Kangaroo; Kookaburra; Kildeer, Kangaroo Rat, Koala
L: Leopard; Lemur; Lion, Llama, Lizard
M: Mongoose; Meercat; Moose, Mountain Lion, Macaw
N: North American River Otter; Newt; Nene, Newfoundland Dog!, Norwegian Elkhound
O: Osprey; Ocelot; Ostrich, Otter, Orangutan
P: Panda; Pig; Platypus, Penguin, Porcupine
Q: Quail; quetzal (dictionary for that one ); Quokka (marsupial), Queen Conch, Queen Bee
R: Rooster; Racoon; Rhinoceros, Rhodesian Ridgeback, Red Tailed Shark
S: Snake; Squid; Squirrel, Slug, Snail
T: Tiger; Toucan; Tree Frog, Titmouse, Tapir
U: Unicorn; Umbrella Bird; Urchin, Ungulate, Unenlagia (Bird-like dinosaur)
V: Vulture; viper; Vole, Vixen the Reindeer, Varmint
W: Wombat; Walrus; Whale, Wallaby, Wildebeest
X: Xolo (that would be a dog); Xue Bao (snow leopard in different language); Xenops (bird),Xenarthra (an order of animals that includes sloths, armadillos and anteaters), Xiaosaurus (dinosaur)
Y: Yak; Yorkie; Yellow Jacket, Yellow Mongoose, Yorksire Terrier
Z: Zebra; Zooplankton; Zorro (dog like fox from S. america), Zorilla ( a skunk-like creature that lives in Africa), Zebrafish