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It also had a thin, yellow bill like a chicken instead of the thick, orange bill of our northern cardinal—a trait that gynandromorphism wouldn’t alter.

As the environment warms, southern species such as the grass wren and the northern cardinal spread further north in search of a suitable climate.

Researchers found that two common songbirds, the Northern Cardinal and Carolina Wren, that live year-round in the urban core of San Antonio, Texas, had eyes about 5% smaller than members of the same species from the less bright outskirts.

Then other birds, like the northern cardinal and the goldfinch.

Shortly after a bright red northern cardinal winged into the Ohio feeder for the second time in two minutes and stuffed its beak, I sent its photo to the family text thread.