I don't really have a favourite. I either like the animals or hate them.
The animals I like are: Flamingo, Galapagos Giant Tortoise, Nile Crocodile, Thompson's Gazelle, Arabian Oryx, American Bison, Reindeer, Pere David's Deer, Okapi, Giraffe, Llama, Hippopotamus, Burchell's Zebra, Black Rhinoceros, Red Kangaroo, Indian Elephant, African Elephant, California Sea Lion, Walrus, Chimpanzee, Common Raccoon, Grizzly Bear, Giant Panda, Polar Bear, Grey Wolf, White Tiger, Cougar, African Leopard, Black Panther, Jaguar, Bengal Tiger, Lion, Komodo Dragon, European Otter, Giant Anteater, Nine-Banded Armadillo, Quagga, Archaeopteryx, Velociraptor and Mammuthus.
The animals I don't like are: Blue Peafowl, King Penguin, Masai Ostrich, Alpine Ibex, European Elk, Dromedary Camel, Warthog, Great White Shark, Killer Whale, Bottlenose Dolphin, Gorilla, Orangutan, Koala, Arctic Hare, Beluga, Manta Ray, Mongolian Wild Horse, Thylacine, Gigantopithecus and Basilosaurus. My excuses? Well...
-The Peafowl breed to quickly and have too many babies.
-The Penguin's herd requirements are stupidly large (20? Huh! Mmost zoos I see King Penguins have at least 3 and they seem happy).
-I find the Ostrich's favourite foliage keeps dying, then they start complaining.
-The Ibex's hill to flat land ratio is annoyingly tight.
-The Elk's requirements are frustrating to find. I spent most of my time trying to satisfy them, deleting stuff over and over again.
-The Warthog's favourite foliage takes up too much flat land.
-The Camel is simply boring.
-I dislike the aqua animals with avengeance because they always need more space, and altering the landscape ends up with ALL the water disapearing and the animals sufficating, which I find very frustrating.
-The Koala, Gorilla and Orangutan simply need too much foliage. At one time, I filled the Koala's cage with foliage COMPLETLY, and they still said they wanted more. If the creators had simply put a "Too much foliage" complaint as well as a "Nnot enough foliage" complaint, then life would have been easier.
-The Arctic Hare is hard to follow, so to speak.
-The Warthog and Wild Horse don't look right.
-The Thylacine is too picky about temperature.
-The Gigantopithecus...well, it doesn't look like a real one. It's supposed to look like a giant gorilla or something, not the next Bigfoot.