why do dolphins jump up out out of the water? is it to locate schools of fish or just because they like it ?

Question: why do dolphins jump up out out of the water? is it to locate schools of fish or just because they like it ?
- Keywords:
  dolphin,
  jump
Asked by anniew to Valeria on 20 Jun 2012.
- Valeria Senigaglia answered on 20 Jun 2012:
  
  Is actually a sign to communicate other dolphins their intentions. They jumps to say: “ehy let’s go” or when they try to conquer the attention of a female.
  
  Sometimes they jump to scratch…

Question: why do dolphins jump up out out of the water? is it to locate schools of fish or just because they like it ?