Natural Disasters, floods are the most common one.

Fish cats attack, can only happen if there is water in camp and will happen if they find out you are planning a way to escape.

Attacks, what they are and what happens if they are not defeated
Creatures in the water, will kill cats and has the chance to get a she-cat pregnant with fish cats.

Birds, a bit rare but will carry away small or weak cats. Might return a pregnant She-cat that will have kits with wings.

Rouges, will take herbs and prey may also take cats and kits and might get she-cat's pregnant.

Merecats, rare but can sometimes happen, they will most likely get a she-cat pregnant with some of there kits the kits will be born with gills and the ability to get a mermaid tail.

That's all of them for now suggest any more that you have.