The general public, however, can continue using bird feeders, Hofmann said. Delaware bird feeders typically attract cardinals, chickadees, titmice and other songbirds, while bird flu is usually found in waterfowl, raptors and vultures.

The Delaware Department of Natural Resources says about 40-50 snow geese have tested presumptive positive for bird flu at the Prime Hook Wildlife Refuge in Milton, Sussex County.

Officials say 40 to 50 snow geese, including some at a southern Delaware wildfire refuge, have tested positive for avian influenza.