Dolphins do not have good eyes and need their echolocation to navigate, find food and communicate. Echolocation is a technique that dolphins use to 'see' what is ahead of them by the use of sounds. These sounds are released at a rate of about 300 sounds a second. Their squeals, that are used by dolphins are for communication and as a way of indicating their emotional states. Their brains are larger then ours.
Dolphins tend to live for about twenty years, but some have been known to live for about forty years When dolphins sleep, they sleep in a semi-alert state by resting one side of their brain at a time If need be, dolphins can hold their breath for 5-8 minutes at a time Dolphins can dive as deep as 200m (that's 650ft)
A dolphin sheds its outer layer of skin every two hours Dolphins will help sick or injured dolphins as much as they can Dolphins work as a team if danger is near by. Every dolphin has its own signature whistle to distinguish itself from its companions, it's like us using names.
