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Dolphins are considered to be one of the most intelligent marine species on the planet.
They use exholocation, dancing and jumping to communicate and get oriented.
Dolphins eat between 11-13 kilos of fish a day.
Like humans and chimpanzees, dolphins can recognize themselves in the mirror or even on tv.
While they sleep turn off only one hemisphere of their brain and the opposite eye, while the other remains awake on constant guard by predators.
Also, dolphins live between 25-30 years, while under human care they can live 60 years.

Interesting information Virginaia - I didn't know about these thing. For example the dancing and jumping is a form of communication, how fascinating. But what is exholocation? I never heard of this.
Can I help?
on constant guard by predators= ..on guard against predators.
they can live 60 years.= Here you can say: they can live up to 60 years
See you soon,
Pieter