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The ribbon seal dives to depths of up to 200 m in search of food; it is solitary and forms no herds. Ribbon seals located in the Bering Sea consume pollock, eelpout, and arctic cod. [14] Adult seals have relatively weak and smooth canines because their food does not need to be viciously torn. [15]
The hooded seal or bladdernose 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. The seals are typically silver-grey or white in color, with black spots that vary in size covering most of the body. [3]
The skull of the leopard seal. The leopard seal has a distinctively long and muscular body shape when compared to other seals. The overall length of adults is 2.4–3.5 m (7.9–11.5 ft) and their weight is in the range 200 to 600 kilograms (440 to 1,320 lb), making them the same length as the northern walrus but usually less than half the weight.
Seal pup first-year survival rates are estimated to vary from 80 to 85% [41] [42] to below 50% [43] depending on location and conditions. Starvation, due to difficulties in learning to feed, appears to be the main cause of pup death. [43] Male grey seals engage in aggressive sexual behaviour, which can lead to severe injuries and even death for ...
Seal hunting stopped in Australia in 1923, and their population is still recovering, causing increasing friction with South Australian fishermen as their range expands. [22] Breeding and haul-out sites are protected by law. South African fur seals have a very robust and healthy population. Harvesting of seals was outlawed in South Africa in 1990.
Crabeater seals can raise their heads and arch their backs while on ice, and they are able to move quickly if not subject to overheating. Crabeater seals exhibit scarring either from leopard seal attacks around the flippers or, for males, during the breeding season while fighting for mates around the throat and jaw. [3]
The bearded seal is unique in the subfamily Phocinae in having two pairs of teats, a feature it shares with monk seals. Bearded seals reach about 2.1 to 2.7 m (6.9 to 8.9 ft) in nose-to-tail length and from 200 to 430 kg (441 to 948 lb) in weight. [5] The female seal is larger than the male, meaning that they are sexually dimorphic.
Elephants can use their ears as threat displays in male-to-male competition. Sexual selection in mammals is a process the study of which started with Charles Darwin's observations concerning sexual selection, including sexual selection in humans, and in other mammals, [1] consisting of male–male competition and mate choice that mold the development of future phenotypes in a population for a ...