Some species, like the humpback whale, will migrate to and from their food supply in order to breed and raise their young, while others stay in the same region year-round. Unlike dolphins, whales only live in salt-water environments. Various species can be found in both warm and cold water. Blue whale calves are around three tons and 25 feet long when they’re born. The blue whale is famously the largest mammal to ever live on earth. For example, the smallest whale species reach less than ten feet in length, while the largest species can be up to or more than 100 feet long. Like dolphins, whale species vary in size and appearance. Whales are also known for their blowholes which allow them to breathe at the water’s surface. They have flippers on either side of their body, (sometimes) a small dorsal fin, a fluke or tail fin of varying size, and small eyes and ears. Whales are large, powerful marine mammals that have long, heavy bodies. They are open-ocean mammals meaning that they spend the entirety of their lives in the open ocean (breeding, feeding, and raising their young). There are eight living families of whales, including the right whales, grey whales, belugas and narwhales, and sperm whales. They can be found worldwide, in warm and cold oceans. Whales are a diverse group of marine mammals. In the wild, the common bottlenose dolphin prefers to live in relatively warm and temperate seas. It lives in nearly all of the world’s oceans except for the extreme northerly and southerly latitudes. But, some species, like sperm whales, feed on larger prey and have diets more similar to dolphins. The common bottlenose dolphin ( Tursiops truncatus) is easily the best-known dolphin species on the planet. This means that they feed on plankton and krill. They usually eat fish, shrimp, small octopuses, and jellyfish, while whales are generally filter feeders. This means that they choose prey that is easily available rather than being too selective in their diet.
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