The common bottlenose dolphin is about 330 – 1,400 lbs. The scientific name for a Bottlenose Dolphin is Tursiops. Bottlenose Dolphins can be found in temperate and tropical waters. They are frequently seen within 20 miles of shore in harbors, bays, lagoons, estuaries, around islands and in large rivers.
Dusky Dolphins live off the coast of South America, South-Western Africa and around New Zealand. The scientific name for a Dusky Dolphin is Lagenorhynchus obscurus. The size for dusky dolphins is 167–178 cm and a weight range of 69–78 kg for females, and a length range of 165–175 cm and a weight range of 70–85 kg for males.
Pink River Dolphin's scientific name is Inia geoffrensis. Pink river dolphins can reach 8 feet in length, but they are usually smaller. On average, Amazon river dolphins weigh between 180 and 220 pounds. The Pink River Dolphin lives only in freshwater. They are found throughout much of the Amazon and Orinoco river basins in Bolivia, Brazil, Colombia, Ecuador, Guyana, Peru, and Venezuela.