Most are spotted. The Grey Seal is a rare visitor. Normally, this large seal breeds in Canada. However, Nantucket and Chatham have recorded Grey seals, making it the southernmost breeding ground on earth for this incredible mammal. During the winter of 1989-90, Grey seals gave birth to nine pups on the Monomoy shoals.
Grey seals are huge.
Adults males may reach a length of ten feet and weigh over 600 pounds. The Wellfleet Bay Sanctuary schedules Seal Watch Cruises to Monomoy Island. Canada geese are year round residents on the Cape. Every season, feathered residents reintroduce themselves and visitors just passing through arrive as if on cue. And, every once in awhile, a spotted redshank or blacktailed godwit turns up on the wrong side of the Atlantic and gives us an awesome treat.