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A few, such as the killer whale, feed on mammals, such as pinnipeds and other whales.They have well-developed senses – their eyesight and hearing are adapted for both air and water, and they have advanced sonar capabilities using their melon.Mothers of some species fast and nurse their young for a relatively short period of time, which is more typical of baleen whales as their main food source (invertebrates) aren't found in their breeding and calving grounds (tropics).Cetaceans produce a number of vocalizations, notably the clicks and whistles of dolphins and the moaning songs of the humpback whale.The extinct ancestors of modern whales are the Archaeoceti.

Some baleen whales (mainly gray whales and right whales) are specialised for feeding on benthic creatures.Dolphins are commonly kept in captivity and are even sometimes trained to perform tricks and tasks, other cetaceans aren't as often kept in captivity (with usually unsuccessful attempts).Cetaceans have been relentlessly hunted by commercial industries for their products, although this is now forbidden by international law.Most mysticetes prefer the food-rich colder waters of the Northern and Southern Hemispheres, migrating to the Equator to give birth.During this process, they are capable of fasting for several months, relying on their fat reserves.

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