In this Thursday, July 18, 2019, photo, research assistant Michael Rickershauser is dive-bombed by common tern as he records data in their nesting colony on Eastern Egg Rock, off the coast of Maine. Padding under his hat helps soften the jab of the pointed beak. The aggressive terns provide protection for puffins by chasing off predatory gulls. (Photo by Robert F. Bukaty/AP Photo)
