Several Falls ago I noticed a chipmunk coming out of his burrow, return a bit later with a face-full of acorns, and disappear down the hole- only to repeat the actions several time in a row. I decided to help, so I collected some acorns and set them on the lip of the burrow. They were completely ignored, and the chippie went on about his business.
OK. So, I put on some work gloves, removed the previously offered acorns, and replaced them with non-human smelling acorns.
Suddenly, the little critter's collection time was cut down to seconds.
I just think this is an interesting observation, though not totally surprising.
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