Okay here they are, there are 48 of them. I dont remember which levels they were unlocked on.
1.Wolf (grey)
2.Wolf (white)
3.Egyptian Dog
4.Camel
5.Dinosaur (red)
6.Dinosaur (blue)
7.Dinosaur (yellow)
8.Alligator
9.Elephant
10.Gorilla
11.Kangaroo
12.Cheetah
13.Oragutan
14.Ostrich
15.Penguin
16.Polar Bear
17.Bengal Tiger
18.White Bengal Tiger
19.Black Leopard
20.Bengal Tiger Cub
21.White Bengal Tiger Cub
22.Cat
23.Dog
24.Gila Monster
25.Swamp Creature (red)
26.Swamp Creature (green)
27.Panda Bear
28.Small Droid (white)
29.Small Droid (red)
30.Small Droid (blue)
31.Big Droid (red)
32.Big Droid (green)
33.Big Droid (blue)
34.Octopus (red)
35.Octopus (blue)
36.Grizzly Bear
37.Deer
38.Dragon (blue)
39.Dragon (red)
40.Dragon (green)
41.Horse (all brown)
42.Horse (brown & white)
43.Horse (black)
44.Unicorn
45.Horse w/ Armor
46.Rabbit (grey)
47.Rabbit (white)
48.Troll