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The shape, size, position and colour of the dorsal fin varies with the type of billfish, and can be a simple way to identify a billfish species. For example, the white marlin has a dorsal fin with a curved front edge and is covered with black spots. [4] The huge dorsal fin, or sail, of the sailfish is kept retracted most of the time. Sailfish ...
The dorsal fin of a northern bottlenose whale in Newfoundland with a large linear scar visible. Distinct markings are used to identify unique individual whales and estimate their population size. When physically mature, northern bottlenose whales can reach 9.8 metres (32 ft) in length, [ 5 ] smaller than giant beaked whales , and larger than ...
The pygmy right whale shares several characteristics with the right whales, with the exception of having a dorsal fin. Also, pygmy right whales' heads are no more than one quarter the size of their bodies, whereas the right whales' heads are about one-third the size of their bodies. [11] The pygmy right whale is the only extant member of its ...
The dorsal fin is sickle-shaped; and flippers are narrow, short, and pointed, with a distinctive bulge on the leading edge of the flipper (the side closest to the head). False killer whales are large marine predators. They are the fourth-largest extant species of oceanic dolphin, exceeded in size only by the orca, and the two species of pilot ...
The southern bottlenose whale measures 7.5 m (25 ft) in length when physically mature, considerably smaller than the northern bottlenose whale. The beak is long and white in males but grey in females. The dorsal fin is relatively small at 30–38 cm (12–15 in), set behind the middle of the back, falcate (sickle-shaped), and usually pointed.
The term sail or dorsal sail has been used to refer to sail-like structures on the back of various animals. Such animals can also be referred to as sail-backed or fin-backed. Such structures include the following: Neural spine sail – formed by the neural spines of the vertebrae; Dorsal fin – in some aquatic species with tall fins on their back.
True’s beaked whales sometimes breach Surfacing patterns of True’s beaked whales. This whale has a normal mesoplodont body, except that it is rotund in the middle and tapering towards the ends. The two distinctive teeth on the males are small and set on the very end of the beak (however additional teeth have been recorded [5]). The melon is ...
A female killer whale surfaces, showing its dorsal fin and saddle patch. See also: Wildlife photo-identification In the early 1970s, Bigg and his colleagues discovered that individual killer whales can be identified from a good photograph of the animal's dorsal fin and saddle patch taken when it surfaces.