The Galapagos sea lion (Zalophus californianus wollebacki) is found in the Galapagos Archipelago where it is one of the most conspicuous
and numerous marine mammals.
Well adapted to its semi-aquatic |
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lifestyle, it has a streamlined body and powerful fins, and as a
member of the eared seals (Otariidae family), which includes fur
seals and sea lions, this aquatic mammal is able to control its
hind flippers independently. This adaptation allows it more agility on
land than seals, which cannot move their hind limbs
independently.
Furthermore, unlike the true seals
(family Phocidae), Z. c. wollebaeki swims using its strong and
well developed fore flippers.
Adult males are much larger than females
and are brown in colour while females are a lighter tan. Adult males are also distinguished by
their raised foreheads, and the hair on the crest may be a
lighter colour. Juvenile Galapagos sea lions
are chestnut brown in colour and measure around 75 cm at
birth. Sea lions show an extreme degree of sexual
dimorphism, with males much larger than females. A male sea lion may
measure up to 2.4 meters (8 feet) and weigh 270 kg (600 lbs); a
female may measure up to 1.8 meters (6 feet) and weigh 90 kg (200
lbs.).
Sea
lions are common in the islands where there are sandy beaches
and gentle rocky shores. It is estimated that there are about
50,000 individuals. Their food is mainly fish for which they
will often make extended trips away from the colony. Little is
known about their life at sea, but on land they form colonies at
their hauling-out areas. |
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