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Bottlenose dolphins have been known to display altruistic behavior by guiding stranded whales into safe open waters.

Tursiops aduncus - the Indian Ocean bottlenose dolphin. Until 1998, all bottlenose dolphins were considered members of the single species T. truncatus. In that year, the Indo-Pacific bottlenose dolphin was recognized as a separate species. The Indo-Pacific bottlenose dolphin is generally smaller than the common bottlenose dolphin, has a proportionately longer rostrum & has spots on its belly & lower sides. It also has more teeth than the common bottlenose dolphin — 23 to 29 teeth on each…

Section through the head of a dolphin, with captions at elements which are important for echolocation. Common Bottlenose Dolphin - Cool and Interesting Facts for Kids