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Species of the infraorder Cetacea A phylogenetic tree showing the relationships among cetacean families. [1]The evolution of cetaceans is thought to have begun in the Indian subcontinent from even-toed ungulates (Artiodactyla) 50 million years ago (mya) and to have proceeded over a period of at least 15 million years. [2]
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.
Some species, such as the humpback whale, communicate using melodic sounds, known as whale song. These sounds may be extremely loud, depending on the species. Humpback whales only have been heard making clicks, while toothed whales use sonar that may generate up to 20,000 watts of sound (+73 dBm or +43 dBw) [55] and be heard for many miles.
Today, 92 whale species can be found swimming in the deep blue sea. Whales are a part of the cetacean family , which is divided into two groups: baleen whales (which don't have teeth) and toothed ...
Whales caught, by year and country Total whales caught since 1900, by species Total whales caught 2010–2014, by country. By 1900, bowhead, gray, and right whales were nearly extinct, and whaling had declined. It revived with the invention of harpoons shot from cannons, explosive tips and factory ships, which allowed distant whaling.
Atlantic gray whale: Eschrichtius robustus: North Atlantic and the Mediterranean: 2007 (IUCN) Whaling. The same species survives in the Pacific Ocean. [218] 1761: Rodrigues parrot: Necropsittacus rodricanus: Rodrigues 1988 (IUCN) Hunting. [219] Rodrigues solitaire: Pezophaps solitaria: 1778 1988 (IUCN) Hunting and predation by introduced cats ...
As many whales begin to leave their protected zones in search of warmer waters, boats should take extra precautions. The post The Latest Whale Species Facing Extinction and What’s NOT Being Done ...
According to the DOC, the spade-toothed whale was first documented in 1874 from lower jaw and teeth samples collected on Pitt Island, around 500 miles off New Zealand’s west coast.