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“I am happy when I watch a tufted titmouse, nuthatch or any other bird fly to one of my feeders and chow down on a big fat nut or seed,” wrote Donna McDowell of Gaithersburg.

Last spring, Dr. Pollock was participating in his university’s annual spring bird count when a tufted titmouse caught his eye.

If you go into the parks, you will see tufted titmice, robins, red-tailed hawks, mourning doves, cardinals and, if you were lucky a few weeks ago, the fabulous snowy owl.

Populations of American crows, tufted titmice, gray catbirds and brown thrashers dropped below normal during the cicada emergence year—and then increased the following year, after which they stabilized.

This is something you’re just not going to see for, say, cockatiels, Labrador retriever puppies, baby giraffes or even a tufted titmouse.