Harp seals are closely related to harbour seals, however they do not live in the North Sea. A lost seal is only occasionally spotted along the Dutch coast. Males have a harp shaped spot on their back while females and young harp seals have a less obvious pattern of black or brown spots. Both sexes can grow to 1.70 meters long and weigh up to 130 kilograms. They live up to 30-35 years old. Harp seals are hunted in abundance in Norway and Canada.