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mk · 4819 days ago · link · · parent · post: Crows have the same ability as humans perform delayed exchange tasks.
Yes, I do think I could train the dog to give the biscuit back even. :) My father had a dog that, when he threw newspapers as a paperboy, if he missed the customer's porch, the dog would pick up the paper and put it on the porch. Dogs are capable of quite a bit if you take the time.
I agree, rats are interesting creatures, -social and communicative. I've worked with lab rats, and even those domesticated and environmentally deprived rats seem to have some complexity going on.