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Tool Use Among Backyard Birds

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I'm curious about nuthatches and downies and how they open black oil sunflower seeds.  I have observed what appears to sometimes be caching behavior (sticking and leaving seeds in bark crevices for later) and, sometimes, tool use (using the crevice to hold the seed while pecking and pulling it open).  Their cousins, titmice and chickadees, appear to hold the seed between their feet for opening, but I've never seen nuthatches or downies do this. 

I found one paper on brown-headed nuthatches and tool use of a more complex kind.THE USE OF TOOLS BY BROWN-HEADED NUTHATCHES

Any thoughts on these birds or observations of your own?


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They stick them in crevices in the bark and break them open by tapping them. I saw it all the time in Missouri.

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