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In effect, "tetrapod" is a name reserved solely for animals which lie among living tetrapods, so-called crown tetrapods. This is a node-based clade , a group with a common ancestry descended from a single "node" (the node being the nearest common ancestor of living species).
Parvorder Mysticeti (Baleen whales) Family Balaenidae (right and bowhead whales) Family Cetotheriidae (pygmy right whale) Family Eschrichtiidae (gray whale) Family Balaenopteridae (rorquals) Parvorder Odontoceti (Toothed whales) Family Physeteridae (sperm whale) Family Kogiidae (pygmy and dwarf sperm whales) Family Ziphiidae (beaked whales)
The evolution of tetrapods began about 400 million years ago in the Devonian Period with the earliest tetrapods evolved from lobe-finned fishes. [1] Tetrapods (under the apomorphy-based definition used on this page) are categorized as animals in the biological superclass Tetrapoda, which includes all living and extinct amphibians, reptiles, birds, and mammals.
Whales are fully aquatic, open-ocean animals: they can feed, mate, give birth, suckle and raise their young at sea. Whales range in size from the 2.6 metres (8.5 ft) and 135 kilograms (298 lb) dwarf sperm whale to the 29.9 metres (98 ft) and 190 tonnes (210 short tons) blue whale, which is the
It was the ancestor of modern whales, dolphins, and porpoises. The cetacea are extensively adapted to marine life and cannot survive on land at all. Their adaptation can be seen in many unique physiognomic characteristics such as the dorsal blowhole , baleen teeth, and the cranial 'melon' organ used for aquatic echolocation .
A humpback whale has stunned scientists with a journey that spanned three oceans and more than 8,000 miles, setting the record for the longest known migration between breeding grounds.
Still, uncovering the scope of whales’ vocal exchanges is an important step toward linking whale calls to specific messages or social behaviors, the scientists reported May 7 in the journal ...
A live humpback whale was found beached on a remote Canada island and closer inspection revealed it was a documented whale not seen in 30 years, according to the Marine Animal Response Society ...