Thanks for the feedback! I'll try to reword the "Outsiders" ability. I think I was trying to avoid being wordy on the board itself, but might've gone too far. If you have any suggestions, let me know. The number of warriors is very limiting, but since they essentially dictate the number of actions you have on a turn (more warriors = more Swarming), I wanted to make sure they didn't overrun the board.
I didn't really have an animal in mind (this was definitely a mechanics-first design), but I like your idea of squirrels!