1.   Adult dolphins also use whistles to communicate with each other.

2.   One small body bore puncture marks matching the pattern of adult dolphin teeth.

3.   After learning of the Scotland study, researchers at the Virginia Marine Science Museum in the United States found similar evidence of adult dolphins killing their young.

4.   But the park will be built around an airport refuelling facility and will be so small an adult dolphin could swim its length in four minutes, conservationists say.

5.   They discovered carcasses of calves washed up on beaches with the same types of injuries and witnessed adult dolphins violently throwing their young in the air.

6.   Referring to the other animal deaths, it said the two seals had been poisoned in unknown circumstances while the adult dolphins were old and died naturally.