Attacks, happens when you either don't patrol or someone uses the start battle command. What can attack you and what can happens if they are not defeated is.

Birds, they can get some species pregnant with other species or an entirely new species. They can also take prey and some people.

Outcasts, they can get females pregnant. They also can take people, sticks, prey and herbs. Password is your favorite part and why it is your favorite.

Other creatures, it depends on what the creatures that attack decide.

Natural disasters, these can happen which ones that happen depends on where you live.

That's all that I can think of right now. Tell me any more you feel should be added of these are any.