Bird rehabilitators treat wildlife at the Wild Bird Fund, a non-profit animal medical group, for sick, injured or orphaned wildlife in New York City, U.S., June 14, 2017.

Olivia Snarski fills out a form for an inured bird brought to the Wild Bird Fund, a non-profit animal medical group, for sick, injured or orphaned wildlife in New York City, U.S., June 14, 2017.

Birds are seen inside a fly room at the Wild Bird Fund, a non-profit animal medical group, for sick, injured or orphaned wildlife in New York City, U.S., June 14, 2017.

Kate Faehling, an animal care manager, gestures as a rescued swan goes for a swim at the Wild Bird Fund, a non-profit animal medical group, for sick, injured or orphaned wildlife in New York City, U.S., June 14, 2017.

Al Salame, a volunteer bird releaser with the Wild Bird Fund, a non-profit animal medical group, for sick, injured or orphaned wildlife, kisses a bird before releasing it to Stuyvesant Town in New York City, U.S., June 15, 2017.

An injured pigeon walks with a cast on its wing at the Wild Bird Fund, a non-profit animal medical group, for sick, injured or orphaned wildlife in New York City, U.S., June 14, 2017.

Image used for illustrative purposes. Eugene Oda, a wildlife rehabilitator and veterinary technician, examines a bird at the Wild Bird Fund, a non-profit animal medical group, for sick, injured or orphaned wildlife in New York City, U.S., June 14, 2017. Reuters/Shannon Stapleton

Baby falcons (American kestrel) are seen inside a cage at the Wild Bird Fund, a non-profit animal medical group, for sick, injured or orphaned wildlife, in New York City, U.S., June 14, 2017.

Bird rehabilitators treat birds at the Wild Bird Fund, a non-profit animal medical group, for sick, injured or orphaned wildlife in New York City, U.S., June 14, 2017.

Rescued baby birds are fed at the Wild Bird Fund, a non-profit animal medical group, for sick, injured or orphaned wildlife in New York City, U.S., June 14, 2017.

Image used for illustrative purposes. A bird sits in a tree after being released by Al Salame, a volunteer bird releaser with the Wild Bird Fund, a non-profit animal medical group, for sick, injured or orphaned wildlife, at Stuyvesant Town in New York City, U.S., June 15, 2017.

Nita Renfrew gives reiki treatment to an injured bird at the Wild Bird Fund, a non-profit animal medical group, for sick, injured or orphaned wildlife in New York City, U.S., June 14, 2017.

Feeder worms are seen at the Wild Bird Fund, a non-profit animal medical group, for sick, injured or orphaned wildlife in New York City, U.S., June 14, 2017.