The smallest species of dolphin is the Hector’s dolphin. Females reach lengths of 1.2-1.4m (4ft-4.6ft) and weigh about 47kg (104 lbs), with the males being slightly smaller. The Hector’s dolphin is found only in New Zealand and has a population of only 7,400 individuals. Its coastal habitat makes it vulnerable to human activity such as chemical pollution, and it is often caught in fishing nets by mistake.
A diagram of a Hector’s dolphin and an average sized human
The smallest species of saltwater dolphin is the Hector’s dolphin, which is about 5 feet long and can weigh up to 110 pounds. The tucuxi dolphin, found in both coastal waters and in the Amazon River, can grow to be even smaller: the average size is 4-6 feet long, and 75-100 pounds. To compare, the orca (or killer whale) is the largest species of dolphin, at a size of 30 feet long and 10,000 pounds.
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