Dolphins are one of the smartest animals on Earth. They can perform tricks
and perform on command if they are taught by a human.
Dolphins usually grey, blackish, or brown , and are about 1-4 metres long.
Dolphins feed primarily on fish, and most of them are gregarious, appearing in
groups of a few to several hundred. A number of species are attracted by
moving ships, often accompanying them or leaping alongside and sometimes
riding the wave created by the moving bow. The bottle-nosed
dolphin, characterised by a "built-in smile" formed by the curvature of its mouth,
has become a familiar performer in oceanaria. It has also become the subject
of scientific studies because of its apparent intelligence and its ability to
communicate with its kind through a range of sounds and ultrasonic pulses.
Dolphins are the smartest animals alive,so Humans have studied them a lot over
the years.