NEWBURYPORT — The best bird-watchers around will flock once again Saturday to vie for the Joppa Cup when the Mass Audubon Joppa Flats Education Center hosts the 21st annual Superbowl of Birding.

"We get some of the most skilled New England bird-watchers involved in the Superbowl of Birding," Mass Audubon North Shore Community Science and Coastal Resilience Manager David Moon said. "They come from all over the eastern Mass. metro area but also out of New Hampshire and we've even had teams from Pennsylvania and Cornell University from Ithaca, New York, which is the epicenter of ornithology in America right now."