More than 160 million wild and domesticated birds have been culled in the U.S. after testing positive for avian flu in the past few years. So why is the country not rushing to vaccinate flocks to stop the spread of the outbreak?

As H5N1 spreads rapidly, wild birds remain at risk. Here’s what to know about the outbreak and how to keep your feathered visitors safe.

A cull of birds is to be carried out in an area of Herefordshire following the confirmation of avian influenza. A 3km (1.8 mile) captive bird monitoring zone has been declared around a premises in Fownhope,