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Dolphins are voluntary breathers, who must deliberately surface and open their blowholes to get air. They can store almost twice as much oxygen in proportion to their body weight as a human can: the dolphin can store 36 milliliters (ml) of oxygen per kg of body weight, compared with 20 ml per kg for humans. This is an adaptation to diving. [100]
Common dolphin are medium-sized dolphins; adults range between 1.9 and 2.5 m (6.2 and 8.2 ft) long, and can weigh between 80–235 kg (176–518 lb), although the range between 80–150 kg (180–330 lb) is more common. [7] Males are generally longer and heavier. [7] The color pattern on the body is unusual.
The bottlenose is between 2 and 4 m (6.6 and 13.1 ft) long, and weigh between 150 and 650 kg (330 and 1,430 lb). [14] Males are generally larger and heavier than females. In most parts of the world, adult length is between 2.5 and 3.5 m (8.2 and 11.5 ft); weight ranges between 200 and 500 kg (440 and 1,100 lb).
The species is an average-sized oceanic dolphin. Females weigh up to 150 kg (330 lb) and males 200 kg (440 lb) with males reaching 2.5 m (8.2 ft) and females 2.3 m (7.5 ft) in length. Pacific white-sided dolphins usually tend to be larger than dusky dolphins. Females reach maturity at seven years.
Dolphins range in size from the 1.7-metre-long (5 ft 7 in) and 50-kilogram (110-pound) Maui's dolphin to the 9.5 m (31 ft) and 10-tonne (11-short-ton) orca. Various species of dolphins exhibit sexual dimorphism where the males are larger than females. They have streamlined bodies and two limbs that are modified into flippers.
Fraser's dolphins are about 1 m (3 ft 3 in) long and 20 kg (44 lb) weight at birth, growing to 2.75 m (9 ft 0 in) and 200 kg (440 lb) by adulthood. They have a stocky build, a small fin in relation to the size of the body, as well as conspicuously small flippers. The dorsal fin and beak are also shorter than other species of dolphin. The upper ...
Its size varies between populations. Dusky dolphins in New Zealand have been recorded with a length range of 167–178 cm (5.48–5.84 ft) and a weight range of 69–78 kg (152–172 lb) for females and a length range of 165–175 cm (5.41–5.74 ft) and a weight range of 70–85 kg (154–187 lb) for males. [4]
[5] [14] [6] The maximum weight for southern right whale dolphins is 116 kg, with maximum lengths reaching 297 cm (117 in) in males and 230 cm (91 in) in females but few specimens have been examined and it is expected they grow larger. [10] On average, males tend to grow slightly larger than females.