Dozens of cats across the U.S. have tested positive for avian flu, federal officials say. The west coast has been hit especially hard.

A big cat sanctuary in Washington is temporarily closed and quarantined after bird flu killed 20 wild cats there, including cougars, bobcats and a tiger.

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.