Antarctic:
* Hourglass dolphin: This species is found in the Southern Ocean, including the Antarctic waters. They are characterized by their distinctive hourglass-shaped dorsal fin.
* Southern rightwhale dolphin: These dolphins are found in the cold waters of the Southern Ocean, including parts of Antarctica. They are known for their slow movements and distinctive black-and-white coloration.
* Peale's dolphin: This species inhabits the subantarctic waters of the Southern Ocean, occasionally crossing into the Antarctic waters. They are known for their long, sleek bodies and prominent beaks.
* Commerson's dolphin: Found in the Southern Ocean and sometimes near the Antarctic Peninsula, Commerson's dolphins have a distinctive black-and-white color pattern and a tall, curved dorsal fin.
Arctic:
* Beluga: Also known as the "white whale," belugas are found in the Arctic Ocean and sub-Arctic seas near Alaska, Canada, Greenland, Russia, and Norway. They are well-adapted to cold waters with their thick layer of blubber.
* Narwhal: These distinctive Arctic dolphins are known for their long, spiral tusks, which are actually elongated canine teeth. They are found in northern Canada, Greenland, and Svalbard.
* Killer whale: While killer whales have a wide distribution, including the Arctic Ocean, they are not considered true Arctic species. They can sometimes be found in the Arctic waters during their seasonal migrations or in search of prey.
* White-beaked dolphin: White-beaked dolphins inhabit cold, sub-Arctic waters in the north Atlantic and Arctic Oceans, including parts of northern Europe and North America.
It's worth noting that certain dolphin species have adapted to thrive in polar waters, exhibiting physiological and behavioral adaptations that enable them to survive and hunt in the harsh polar environments.