The grasslands around the ruins have what you would expect in terms of animal and wildlife:

Bunnies, weasels, moles, foxes, various birds, grass snakes, hedgehogs, field mice, you know, the usual  things.

In terms of monsters, sparing and lonely low-level creatures like mites, kobolds, the occasional goblin and maybe a few big spiders. Nothing too dangerous and certainly nothing you guys can't handle.