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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]
Ballooning is a term used for the mechanical kiting [16] [17] that many spiders, especially small species such as Erigone atra, [18] as well as certain mites and some caterpillars use to disperse through the air. Some spiders have been detected in atmospheric data balloons collecting air samples at slightly less than 5 km (16,000 ft) above sea ...
As such, they do not suffer snow blindness. [57] [56] Pinnipeds appear to have limited color vision as they lack S-cones. [58] Flexible eye movement has been documented in seals. [59] The walrus can project its eyes out from its sockets in both a forward and upward direction due to its advanced extraocular muscles and absence of an orbital roof ...
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.
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 ...
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