英语阅读海豚dolphins课件.ppt
Dolphin
  Dolphins are marine mammals closely related to whales and porpoises. There are almost forty species of dolphin in 17 genera.  They are found worldwide, mostly in the shallower seas of the continental shelves, and are carnivores, eating mostly fish and squid.
Risso's Dolphin
bottlenose dolphin
OrcaKiller Whale