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The walrus palate is uniquely vaulted, enabling effective suction; researchers measured pressures in the oral cavity as low as -87.9 kPa in air, and -118.8 kPa underwater. [78] Walruses at the Tierpark Hagenbeck were easily able to suck the five-pound metal plug out of the bottom of their pool, at a water depth of 1.1 metres. [79]
The flexible ribcage allows lung collapse, reducing nitrogen intake, and metabolism can decrease to conserve oxygen. [28] [12] Between dives, the sperm whale surfaces to breathe for about eight minutes before diving again. [29] Odontoceti (toothed whales) breathe air at the surface through a single, S-shaped blowhole, which is extremely skewed ...
The most common pinniped species kept in captivity is the California sea lion as it is abundant and easy to train. [153] These animals are used to perform tricks and entertain visitors. [154] Other species popularly kept in captivity include the grey seal and harbor seal. Larger animals like walruses and Steller sea lions are much less common ...
Tourists who want to view Alaska's Pacfic walrus may want to do it sooner rather than later. The Interior Department has decided that global warming is threatening the Pacific walrus, but will not ...
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It's estimated there are 12,500 adult Atlantic walruses left in the world. They were, at one time, overhunted for blubber and ivory - but commercial hunting was banned last century.
This is an accepted version of this page This is the latest accepted revision, reviewed on 9 February 2025. Taxonomic group of semi-aquatic mammals Pinnipeds Temporal range: Latest Oligocene – Holocene, 24–0 Ma Pre๊ ๊ O S D C P T J K Pg N Clockwise from top left: Grey seal (Halichoerus grypus), Steller sea lion (Eumetopias jubatus), New Zealand fur seal (Arctocephalus forsteri), walrus ...
It possibly arrived through crossing an ice-bridge at a time of low sea-levels, such as particularly cold periods 340,000 years ago, 150,000 years ago or 25,000 years ago. Its nearest relative was the maned wolf, an extant South American canid. [10] [11] It became extinct in the mid-19th century [1] as human settlement spread.