The Mass Gov website, Division of Fish and Wildlife, advises that if 5 or more wild birds are found dead, that they be reported via their web page as they are tracking Avian Flu

When to report:

If you find 5 or more sick or deceased wild birds at a single location
If you observe a deceased bald eagle, peregrine falcon, or snowy owl

https://www.mass.gov/forms/report-observations-of-dead-wild-birds

They also have a form for domestic poultry.

Thanks to a friend who found a dead heron on a trail and notified us! We are interested in all creatures, great and small, furry and feathery!