Orcas prefer cold water because it allows them to travel more swiftly than their ectothermic prey, which can slow down in colder water.
Although they may be located in warmer seas near the equator as opposed to arctic waters, these species appear to favor colder temperatures. Along with living in waters deep in the open ocean, orcas may also venture into semi-enclosed oceans, river mouths, and ice-covered regions.
Marine animals with warm blood, such as whales, can withstand frigid water temperatures. When whales descend to chilly depths and travel to frigid waters, such as those in Alaska, fat serves as an insulating layer to help them preserve energy and warmth.
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