On yesterday's walk we saw masses of ducks continuously paddling in tight rings. There were multiple circles operating at once. Some birders happened to be nearby doing a bird count. It turns out these ducks are northern shovelers. It is thought that they swim in tight circles to set up a rotation, an agitation or vortex, that brings up food to the surface.....algae, crawfish, slugs, and whatever else ducks eat. We could learn a lot from their cooperation.
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