Its average length is 5 ft. (1.5m). Gray Seal. The seals are typically silver-grey or white in color, with black spots that vary in size covering most of the body. Gracie the Gray Seal. Its undersides are pale grey / white. Life cycle bioenergetics of the gray seal (Halichoerus grypus) in the Baltic Sea: Population response to environmental stress December 2020 Environment International 145:106145 Life Span: Female grey seals may live for 35 years, but males seldom survive to more than 25 years old. The total estimated grey seal population size … The ringed seal is the most common Arctic seal. Population: Abundant, has risen steadily since the 1980s. The hooded seal (Cystophora cristata) is a large phocid found only in the central and western North Atlantic, ranging from Svalbard in the east to the Gulf of St. Lawrence in the west. Distribution & Habitat Grey seals around Great Britain are found mainly along exposed rocky northern and western coasts. Gray seals gather in large groups during the mating/pupping and molting seasons. The Grey Seal is a large seal of the family Phocidae or ‘true seals’. Marine mammals such as gray seals rely on extensive blubber layers for insulati … Life cycle bioenergetics of the gray seal (Halichoerus grypus) in the Baltic Sea: Population response to environmental stress Environ Int. 2020 Oct 7;145:106145. doi: 10.1016/j.envint.2020.106145. The grey seal (Halichoerus grypus) is found on both shores of the North Atlantic Ocean.It is a large seal of the family Phocidae, which are commonly referred to as "true seals" or "earless seals".It is the only species classified in the genus Halichoerus.Its name is spelled gray seal in the US; it is also known as Atlantic seal and the horsehead seal. The TEXT of this page is licensed under the Creative Commons Attribution-NonCommercial License - Version 3.0. Page: Tree of Life Halichoerus grypus. The interaction of grey seals and cod in the St. Lawrence is being extensively studied due to the impact of seal predation and parasites. Home; Description; Feeding and Predation; Life Cycle; Migration Pattern; Anthropogenic Threats; Works Cited; Powered by Create your own … Predators: Killer whales and sharks. It is the only species classified in the genus ‘Halichoerus’. The Grey Seal is found on both shores of the North Atlantic Ocean.. Its name is alternatively spelled Grey seal and it is also known as Atlantic Grey Seal.. During the rest of the year, they can be found alone, in small groups or at large aggregations either on land or at sea.Gray seals can dive to 1,560 feet for as long as one hour. The ringed seal is the smallest Arctic seal, and one of the smallest of all seal species. 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