Studies have found there to be two different types of cochlea in the dolphin population.

The true effect on wild dolphin populations of prolonged exposure to chemical pollutants is hard to measure.

"I don't see why Hong Kong should lose its dolphin population."

This eventually brought the Minnesota Zoo's dolphin population up to 7.

Over exploitation of fish by fisheries' is another threat for the dolphin population.

Aside from this the park has a number of endangered turtle and dolphin populations.

Boats take people out daily to snorkel and interact with the local dolphin population.

In addition, the law calls for a three-year study of the effect on dolphin populations.

They do not argue that the dolphin population at large is seriously endangered.

The data are also used to clarify some life history parameters to estimate dolphin population through mark/recapture analysis.