how many dolphins are born at a time
Dolphin Dolphin copulation happens belly to belly; though many species engage in lengthy foreplay, the actual act is usually brief, but may be repeated several times within a short timespan.[67] The gestation period varies with species; for the small Tucuxi dolphin, this period is around 11 to 12 months,[68] while for the orca, the gestation period is around 17 months.[69] Typically dolphins give birth to a single calf, which is, unlike most other mammals, born tail first in most cases.[70] They usually become sexually active at a young age, even before reaching sexual maturity.[67] The age of sexual maturity varies by species and gender.[71]
Amazon river dolphin The Amazon river dolphin is the largest species of river dolphin, with adult males reaching 185 kilograms (408 lb) in weight, and 2.5 metres (8.2 ft) in length. Adults acquire a pink color, more prominent in males, giving it its nickname "pink river dolphin". Sexual dimorphism is very evident, with males measuring 16% longer and weighing 55% more than females. Like other toothed whales, they have a melon, an organ that is used for bio sonar. The dorsal fin, although short in height, is regarded as long, and the pectoral fins are also large. The fin size, unfused vertebrae, and its relative size allow for improved manoeuvrability when navigating flooded forests and capturing prey.