Bird flu has been on the rise in Washington state and one sanctuary was hit hard: 20 big cats – more than half of the facility’s population – died over the course of weeks.

A wildlife sanctuary in Washington announced it is going into quarantine until further notice after 20 big cats died due to bird flu infections. The Wild Felid Advocacy Center in Shelton, Washington,

The Wild Felid Advocacy Center in Shelton, Washington, about 80 miles west of Seattle, cares for displaced wild felines, such as cougars, bobcats, servals, tigers, lynxes and more. The nonprofit lost 20 cats since November. Animal health officials confirmed the cause was avian influenza, according to their Facebook.