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finding food is inherited; thus genetic. Cardinals and Blue Jays don’t scratch but are constantly fh the presence of birds that do. They can easily observe the effectiveness of the method but do not learn to do it themselves.
I have frequently observed a jay sweeping aside snow with its bill which is used like a broom. After the heavy snow of 1996, jays did this frequently on our platform. Other birds quickly rushed in to take advantage after the jay flew off.
Birds not only uncover hidden seed when they scratch. The double scratch is mightly effective in quickly uncovering insects. With the first jump, the insect is alerted. The second causes it to scurry away, or attempt to do so. This is when the scratcher sees and quickly consumes the critter.
There is much more to feeder watching than observing and looking for new species. I find the doublescratch particularly satisfying to watch. When the Whitethroated Sparrow decides to indulge in this inherited trait on the feeder, he sends seed flying in all directions. Much of it lands on the ground. In that case, other ground feeding birds enjoy the new food supply. It is all part of a good show.
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