Dolphins are mammals. There are various types of dolphins but bottlenose dolphins are the most common dolphin......... .

Dolphins live in the ocean. Oceans are made up of ......... water.

Dolphins are very intelligent and use whistles and squeaks to......... with other dolphins.

They understand each other well and scientists believe that they have their own ......... .

Dolphins look like they have fun in the ocean because they play with each other as well as......... out of the water. Another word for this is jump.

Dolphins and whales are examples of sea or......... mammals because they are warm-blooded but live in the ocean.

Fish and sharks, however, are ......... -blooded animals.

Fish can breathe under water because they have......... . Dolphins don't have these.

Dolphins don't have......... like fish but, instead, have smooth, rubbery skin.

Fish can breathe under water but dolphins have ......... so they must come up to the surface for air.