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The blue whale is the largest animal known ever to have existed. [42] [43] [44] Some studies have estimated that certain shastasaurid ichthyosaurs and the ancient whale Perucetus could have rivalled the blue whale in size, with Perucetus also being heavier than the blue whale with a mean weight of 180 t (180 long tons; 200 short tons).
The largest land mammal extant today is the African bush elephant. The largest extinct land mammal known was long considered to be Paraceratherium orgosensis, a rhinoceros relative thought to have stood up to 4.8 m (15.7 ft) tall, measured over 7.4 m (24.3 ft) long and may have weighed about 17 tonnes.
The largest extant monotreme (egg-bearing mammal) is the western long-beaked echidna (Zaglossus bruijni) weighing up to 16.5 kg (36 lb) and measuring 1 m (3.3 ft) long. [88] The largest monotreme ever was the extinct echidna species Murrayglossus hacketti , known only from a few bones found in Western Australia .
The blue whale (Balaenoptera musculus) is the largest cetacean on the planet. While some have claimed that there were dinosaurs that topped its size, there is no scientific data to support that ...
The African bush elephant (Loxodonta africana) is the largest living land animal. A native of various open habitats in sub-Saharan Africa, males weigh about 6.0 tonnes (13,200 lb) on average. [24] The largest elephant ever recorded was shot in Angola in 1974. It was a male measuring 10.67 metres (35.0 ft) from trunk to tail and 4.17 metres (13. ...
The term "marine mammal" encompasses all mammals whose survival depends entirely or almost entirely on the oceans, which have also evolved several specialized aquatic traits. In addition to the above, several other mammals have a great dependency on the sea without having become so anatomically specialized, otherwise known as "quasi-marine ...
Marine mammals comprise over 130 living and recently extinct species in three taxonomic orders.The Society for Marine Mammalogy, an international scientific society, maintains a list of valid species and subspecies, most recently updated in October 2015. [1]
Orcas have the second-heaviest brains among marine mammals [133] (after sperm whales, which have the largest brain of any animal). [134] Orcas have more gray matter and more cortical neurons than any mammal, including humans. [135]