Nearly all animals from Frontier-Zoo are terrible. I said this long ago (and got lashed for it

)..
There was a bug with the colours underlying the genes. In trade window they where green, whereas later, when you put the animals ingame and checked them in their habitat, the same genes were yellow (or previously yellow genes were now red). It seems, they killed that bug now. And now you'll see the crappyness of the Frontier-Zoo generated animals at first sight.
P.S: No harm intended. I just wondered why nobody did notice this discrepancy (stats showing green and later yellow/ yellow and later red) before.