cofty:These links shall show which scientifc areas are touched of the question at hand ….....about evil and animals at hand. As mere armchair biologist and armchair theologian I do my best to collect english info for you all.
I think that we have to accept joy and pain as a package, because obviously human and animal life would not be possible at all without that „life principles“: Fear – run away, suffering - improvement, whatever the professional names for these processes are, it seems to be right what was said: we live in the best possible world according to Leibnitz, but some evil accidents even a „perfect“ evolution could not be changed by evolution, like the hunters killing lovely deers, or terrorists killing nice babes on a beach.
The testimonals and stories of the bible are a guide even for this question.
The answers about life and suffering are not written in the bible, Job didnt get the answer for his suffering, but he had hope that his suffering cries to heaven, as we have. Our God is a loving kindness god and a suffering God too, as Jesus demonstrated on the cross. The redeem cant be without suffering, love cant be without suffering, love cant be without tears, thats a christian principle.
For the ancient antic world, judaism, too the fate of humankind and fate of cosmos was the same, and too the fate of animals.