Effort to protect, track nesting terns in harbor turns up surprising results Amid the swarming, screeching, stinking mass of 40,000 or so ring-billed gulls, 180 nesting pair of common terns are hurriedly raising their chicks on Interstate Island in the middle of the Twin Ports harbor. 10:00 pm, Jul. 17, 2016 × A tern chick opens its mouth hoping to be fed by an adult carrying a small fish on Interstate Island. Bob King / rking@duluthnews.com Amid the swarming, screeching, stinking mass of 40,000 or so ring-billed gulls, 180 nesting pair of common terns are hurriedly raising their chicks on Interstate Island in the middle of the Twin Ports harbor.