If two of the boxes have 5 animals available, there is a decent chance that we have not discovered all of the animals from the Far East box yet (only 3 mentioned on this forum, so far).
Far East Box
Kirin - Far East Box
Mandarin Duck - Far East Box
Racoon Dog - Far East Box
Monster Box
Cerberus - Monster Box
Ghost - Monster Box
Imp - Monster Box
Werewolf - Monster Box
Wendigo - Which Box ??
Winter Box
Snow Owls - Winter Box
Snow Fairies - Winter Box
Snowman - Winter Box
Snowshoe Hare - Winter Box
Yeti - Winter Box
The above post says Winter Box for the "Wendigo" but Wikipedia's description implies it may come from the Monster Box:
The Wendigo (also known as Windigo, Weendigo, Windago, Waindigo, Windiga, Witiko, Wihtikow, and numerous other variants)[1] is a mythical creature appearing in the mythology of the Algonquian people. It is a malevolent cannibalistic spirit into which humans could transform, or which could possess humans. Those who indulged in cannibalism were at particular risk,[2] and the legend appears to have reinforced this practice as a taboo.
Wendigo psychosis is the name conventionally given to a culture-bound disorder which involved an intense craving for human flesh and the fear that the sufferer would turn into a cannibal. This once occurred frequently among Algonquian Native cultures, but has declined due to the Native American urbanization.
Recently the Wendigo has also become a horror entity of contemporary literature and film, much like the vampire, werewolf, or zombie, although these fictional depictions often bear little resemblance to the original entity.[3]
IMAGE of a Wendigo found via Google search (not from Zoo Story 2):