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They range in size from 1.2 m and 45 kg (like the Baikal seal) to 5 meters and 3,200 kg (like the northern elephant seal, which is the largest member of the order Carnivora). Some are dark gray or black, while others can be brown, tan, or even silvery-white. Many also have unique patterns or spots. Their limbs have evolved into flippers.
The earless seals, phocids, or true seals are one of the three main groups of mammals within the seal lineage, Pinnipedia. All true seals are members of the family Phocidae (/ ˈ f oʊ s ɪ d iː /). They are sometimes called crawling seals to distinguish them from the fur seals and sea lions of the family Otariidae.
The average weight of Hawaiian monk seal pups may range from 30 to 40 pounds and they may be as long as 3 feet. But within 6 weeks, they may grow as heavy as 150 to 250 pounds. The size and weight of adult female Hawaiian monk seals is usually bigger and larger than their male counterparts.
Earless seals (Phocidae) such as Harbor seals, gray seals, elephant seals and leopard seals swim with their hind-flippers. There are two kinds of pinniped back limb positions: 1) sea lions and fur seals have forward-pointing back limbs, which allow them to get around better on land.
Typically making dives as deep as 70 meters when foraging, Gray seals can also go to depths of about 300 meters. Mother and baby seals form a strong bond at birth. A mother recognizes her pup by its call and scent.
True seals also swim differently from eared seals, getting most of their propulsion from their fused, tail-like rear flippers and undulating motions similar to a dolphin to propel themselves, while the eared seals use their strong front flippers as big, highly effective oars, appearing to fly through the water like birds.
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Jan 1, 2018 · They are distinguished from sea lions and fur seals (family Otariidae), by the absence of external visible ear pinnae, internal testes, generally larger size, and the inability to draw their hind limbs forward under their body when on land (King, 1983).
