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[20] [75] Narwhals drown if open water is no longer accessible and ice is too thick for them to break through. Breathing holes in ice may be up to 1,450 m (4,760 ft) apart, which limits the use of foraging grounds. These holes must be at least 0.5 m (1.6 ft) wide to allow an adult whale to breathe. [28]
In cetology, the study of whales and other cetaceans, a blowhole is the hole (or spiracle) at the top of the head through which the animal breathes air. In baleen whales , these are in pairs. It is homologous with the nostril of other mammals , and evolved via gradual movement of the nostrils to the top of the head. [ 1 ]
Whales lessen the chance of predation by gathering in groups. This however means less room around the breathing hole as the ice slowly closes the gap. When out at sea, whales dive out of the reach of surface-hunting orcas. Polar bear attacks on belugas and narwhals are usually successful in winter, but rarely inflict any damage in summer. [78]
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Breathing holes may be up to 1,450 m (4,760 ft) apart: I'd clarify that we mean holes in the ice, not holes in the narwhals. Clarified; I'd link beluga whale. Done Linked on second mention; better if on first. UndercoverClassicist T·C 17:53, 29 January 2024 (UTC) Fixed 20 upper 19:13, 30 January 2024 (UTC)
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