[39] Levels of predation may be high enough to cause a population decline at these sites.
The males reach sexual maturity around the same time, but do not become territorial or mate until 6–10 years. The following year they will return to give birth to a single pup after a nearly yearlong pregnancy, and mate once again to continue the cycle.

Although they are not migratory, they have been observed wandering hundreds of miles from their breeding grounds in times of scarce resources. Learn about the Guadalupe fur seals of Guadalupe Island, off the northwestern coast of Baja California, Mexico. Fur seals and sea lions make up the family Otariidae.

Females spend most of the gestation period at sea, coming ashore just before the birth of a single pup (sometimes two) between October and December. Upon arriving to the breeding grounds, females give birth to their pups from the previous season. The large northern fur seal, found in chilly northern waters, was hunted to near extinction during the 19th century.

They feed on moderately sized fish, squid, and krill.

A.

Fur seals are often found near isolated islands or peninsulas, and can be seen hauling out onto the mainland during winter. [4] Many populations, notably the Guadalupe fur seal, northern fur seal, and Cape fur seal, suffered dramatic declines and are still recovering. Black Flying-foxes are the largest species of flying-fox in Australia. Some males and females within the same species have significant differences in appearance, further contributing to the sexual dimorphism. Subantarctic fur seal breeding colonies overlap with Antarctic fur seals, Arctocephalus gazelle, habitat and there is evidence of some inter-breeding between these species at Marion and Macquarie Islands.

In all cases, the males arrive a few weeks early to fight for their territory and groups of females with which to mate.

Typically, fur seals gather during the summer in large rookeries at specific beaches or rocky outcrops to give birth and breed. This can also increase the possibility of ‘exotic’ injuries to humans. Colour patterns are highly variable, and scientists reported that some hybridization between Subantarctic and Antarctic fur seals has occurred. [38] Trawling activities developing around Macquarie Island may affect the prey base of the primarily fish-eating Antarctic fur seals that breed on those islands. They typically spend about 70% of their lives in subpolar, temperate, and equatorial waters.

The Juan Fernandez fur seals deviate from this typical behavior, using aquatic breeding territories not seen in other fur seals. In 2015 a man was rescued from a South Georgia Island by British Forces after receiving a serious bite from a fur seal.

Size ranges from about 1.5 m, 64 kg in the male Galapagos fur seal (also the smallest pinniped) to 2.5 m, 180 kg in the adult male New Zealand fur seal. Aboriginal and Torres Strait Islander collection, Australian Museum Research Institute (AMRI), Natural Sciences research and collections, Australian Museum Lizard Island Research Station, 2019 Australian Museum Eureka Prizes finalists, Become a volunteer at the Australian Museum, Image: flickr: maxfear massimiliano sticca.

Princeton: Princeton University Press.

Description. These opportunistic mammals tend to feed and dive in shallow waters at night, when their prey are swimming near the surface. Females and juveniles tend to be paler, almost grey with lighter undersides. The adult male is deep brown in colour with a grayish mane and grows to about 3.1 metres (10 feet) in length and 300 kg (660 pounds) in weight; the female is dark gray and grows to about 1.5 metres (5 feet) and 60 kg (130 pounds). The Australian Museum is closed to the public until Spring 2020 to enable a major renovation. These seals appear to be solitary when foraging and migrating.

The southern group includes Antarctic, Galapagos, Guadalupe, Juan Fernandez, New Zealand, brown, South American, and subantarctic fur seals. Most fur seal pups are born with a black-brown coat that molts at 2–3 months, revealing a brown coat that typically gets darker with age.
At birth, mean standard length is 67.4cm (58–66) and mass is 5.9kg (4.9–6.6) in males and 5.4kg (4.8–5.9) in females. Adult males are dark brown in colour.

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