Dolphin

A dolphin is a type of mammal that belongs to the group of toothed whales.
Dolphins are highly intelligent, social, and playful animals that live in the ocean or in some rivers.
Dolphins have a sleek, spindle-shaped body, a beaklike snout, and simple needlelike teeth.
They use echolocation to find their prey, which consists mainly of fish and squid.
Dolphins communicate with each other using squeaks, whistles, and clicks.
Some dolphins can also recognize themselves in a mirror, which shows a degree of self-awareness.
Dolphins are often friendly to humans and can perform amazing tricks in captivity.
However, dolphins also face many threats from hunting, fishing nets, climate change, and habitat loss.

• The bottlenose dolphin is one of the most widespread and well-known dolphin species.
  It lives in the Atlantic, Pacific, and Indian oceans, as well as the Mediterranean Sea.
  It can adapt to different environments, from shallow bays and estuaries to deep offshore waters.

• The orca, or killer whale, is the largest dolphin species.
  It lives in diverse marine environments both the Arctic and Antarctic regions, as well as other regions.
  It is a highly social and intelligent animal that hunts in groups called pods.
  It feeds on fish, seals, penguins, and sometimes other whales.

• The Yangtze river dolphin, or baiji, is a freshwater dolphin that only lives in the Yangtze river in China.
  It is one of the most endangered dolphin species, with only a few individuals left in the wild.
  It is threatened by habitat loss, pollution, overfishing, and boat traffic.

• Hector's dolphin is a small dolphin that lives in the coastal waters of New Zealand.
  It is the smallest and rarest marine dolphin.