Cetacea (/sɪˈtʃə/) is a widely distributed and diverse clade of aquatic mammals that today consists of whales, dolphins, and porpoises. Cetaceans are carnivorous and finned. Most species live in the sea, some in rivers. The name is derived from the Latin cetus “whale”, itself from the Greek κῆτος kētos “huge fish”.

There are around 89 extant species, which are divided into two groups or parvorders, the Odontoceti or toothed whales, a group of more than 70 species that includes the dolphins, porpoises, belugas, narwhals, sperm and beaked whales, and the Mysticeti or baleen whales, of which there are now 15 species. The extinct ancestors of modern whales are the Archaeoceti.

Killer whale swimming through a Canadian inlet - Nature Stock Photo Agency
Indo-pacific Humpback dolphin with baby - Nature Stock Photo Agency
Humpback slapping down after a breach - Nature Stock Photo Agency
Sperm whale with a fluke an some pooh - Nature Stock Photo Agency
Humpback whale near Alert Bay, Vancouver Island - Nature Stock Photo Agency
Indo Pacific Humback dolphin swimming near the fishermen villages - Nature Stock Photo Agency
Indo Pacific Humback dolphin taking a dive - Nature Stock Photo Agency
Killer whale swimming through the inlets near Alert Bay - Nature Stock Photo Agency
Large orca bull swimming in the Vancouver inlets - Nature Stock Photo Agency
Common dolphin near the island of Pico, Azores - Nature Stock Photo Agency
Orca swimming between Vancouver Island and Alert Bay - Nature Stock Photo Agency
Humpback whale swimming through the inlets near Vancouver - Nature Stock Photo Agency
Humpback whale swimming in the Vancouver inlets - Nature Stock Photo Agency
Blue whale coming to the surface for breathing - Nature Stock Photo Agency
Small group of Risso’s dolphins - Nature Stock Photo Agency
Indo Pacific humpback dolphin fluke - Nature Stock Photo Agency
Sei whale in th Azores - Nature Stock Photo Agency
Fin whale near the shore of Lajes - Nature Stock Photo Agency
Indo Pacific humpback dolphin tailslap - Nature Stock Photo Agency
Indo Pacific humpback dolphin coming up - Nature Stock Photo Agency
Indo Pacific humpback dolphin fluke - Nature Stock Photo Agency
Group of Risso’s dolphins - Nature Stock Photo Agency
Indo-Pacific humpback dolphin diving near the shore - Nature Stock Photo Agency
Indo-Pacific humpback dolphin dorsal fin dive - Nature Stock Photo Agency
Info Pacific Humpback dolphin tail slapping - Nature Stock Photo Agency
Indo-pacific humpback dolphin surfacing - Nature Stock Photo Agency
Indo-pacific humpback dolphin breaching - Nature Stock Photo Agency
Indo-pacific humpback dolphin passing by the boat - Nature Stock Photo Agency
Indo-Pacific humpback dolphin diving - Nature Stock Photo Agency
False killer whale taking a breath while passing - Nature Stock Photo Agency
Striped dolphin on the run in front of Pico - Nature Stock Photo Agency
Risso’s dolphins synchronized swimming - Nature Stock Photo Agency
Areal view of Tenerife with short-finned pilot whale - Nature Stock Photo Agency
Risso dolphin on the surface - Nature Stock Photo Agency
Fin whale in front of agrarian coast of Pico - Nature Stock Photo Agency
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