The common cuckoo bird has only been spotted four times in U.S. history in the lower 48 states, experts say. Now, it's in Riverhead.

The species is “very territorial” and aggressive, and threatens native bird species, the California Department of Fish and Wildlife says.

Some of their predators, like hawks, are also on the move. If a blue jay catches a glimpse of one, it will chirp to let its ...