Great idea, since they don't have a fight or flight reaction! I wonder if some kind of simple thermal camera/PIR sensor could be useful here. Tangentially rela

Great idea, since they don't have a fight or flight reaction! I wonder if some kind of simple thermal camera/PIR sensor could be useful here. Tangentially related I'm curious if it might be possible to distinguish hedgehogs that come into our garden based on their spines (I understand their paw-prints are similar to human fingerprints, but recording that automatically might be trickier!).