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Rorquals (/ ˈ r ɔːr k w əl z /) are the largest group of baleen whales, comprising the family Balaenopteridae, which contains nine extant species in two genera.They include the largest known animal that has ever lived, the blue whale, which can reach 180 tonnes (200 short tons), and the fin whale, which reaches 120 tonnes (130 short tons); even the smallest of the group, the northern minke ...
Blainville's beaked whales do not capture prey by biting. They use suction feeding to capture prey. They create low pressure in the mouth by retracting tongue, and using throat grooves to expand throat volume. This creates a lower pressure in the mouth than the surrounding waters, allowing the whale to suck in water and whole prey. [12]
As the whales swim up to the surface to feed they can hold up to 15,000 gallons of sea water in their mouths. [citation needed] Humpback whales have 14 to 35 throat grooves that run from the top of the chin all the way down to the navel. [3] These grooves allow the mouth to expand. [3]
Fossils have revealed an ancient marine reptile with a loosely connected jaw that allowed its throat to balloon out to a massive size so it could filter feed the way right whales do today.
Whaling in Canada encompasses both aboriginal and commercial whaling, and has existed on all three Canadian oceans, Atlantic, Pacific, and Arctic.The indigenous peoples of the Pacific Northwest Coast have whaling traditions dating back millennia, and the hunting of cetaceans continues by Inuit (mostly beluga and narwhal, but also the subsistence hunting of the bowhead whale).
A humpback whale was freed from over 50 ropes and fishing gear in a four-day rescue off the western Canadian coast. Experts say such entanglements are on the rise.
Dwarf sperm whale calves typically start eating solid food once they have reached a size of around 1.35 m (4 ft 5 in) though are not fully weaned until they reach around 1.5 m (4 ft 11 in). Toothed whale calves generally start eating solid food at around 6 months, and mothers stop lactating after around 18 to 20 months. [7]
The family Balaenidae, the right whales, contains two genera and four species. All right whales have no ventral grooves; a distinctive head shape with a strongly arched, narrow rostrum, bowed lower jaw; lower lips that enfold the sides and front of the rostrum; and long, narrow, elastic baleen plates (up to nine times longer than wide) with fine baleen fringes.
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