Also boxing then unboxing will work to, since that's a whole lot easier.. But this should only be a temporary work aroundI think it's a general problem in the game, got the same thing for several animals in different habitats, sometime they lie directly in the water and die by thirst...
Puttting them into the trade center and back into the habitat helps, but of course it's no longtime solution
I have 50 water faucets in the habitats. the animals die literally ON the water faucet. It's a bugHave you tried moving the water source and move them to the water? Sometimes you need to do that several times. And checking traversability of the habitat may also give a clue. It happened to me once, and moving the crane and the animal worked. You may also check of there is a dirty pond in the habitat. Good lock.