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He pointed to other examples of successful animal control programs, including trapping brown-headed cowbirds to benefit the least bell’s vireo, a small endangered bird.

They withstand enormous loads of the virus without getting sick, passing it on to local species, like blackbirds, cowbirds, and grackles, that mix with migrating flocks.

At first, I suspected brown-headed cowbirds, famous as they are for raiding nests.

They’re the victims of a “brood parasite” called the cowbird, which adds its own egg to their clutch, tricking another species into raising its offspring.

"The best solution is to leave cowbirds eggs alone," Dr. Steve Rothstein, Emeritus Professor of Zoology at the University of California, Santa Barbara, told Audubon.