The arms are moved in a circular motion akin to the butterfly stroke.

At the age of 26, he had given up freestyle, and placed his efforts in the newly created butterfly stroke.

Two striking bodies were swimming after the big man, lifting themselves rhythmically out of the water with the butterfly stroke.

He does a dog paddle, then the butterfly stroke for a minute or so.

Another son, Sydney, was the originator of the butterfly stroke.

The butterfly stroke has three major parts, the pull, the push, and the recovery.

This was the first time that the butterfly stroke had appeared in the Olympic Games.

For the first time, the butterfly stroke was contested as a separate event.

This race consisted of four lengths of the pool all in butterfly stroke.

The water starts to chop, the steady breathing of her butterfly stroke interrupted.

His account of the common dolphin, written nearly 2500 years ago, is so thorough that little can be added to it even today.

The Short-beaked common dolphin has a gestation period of 10 to 11 months.

Captured common dolphins are said to be difficult to keep in captivity.

In the water, a super-pod of 5,000 common dolphins also hunts down the sardines.

The common dolphin travels in schools of up to a thousand or more individuals.

A total of 65 common dolphins have been beached on Cornish shores so far in 1992, three times the normal annual figure.

Long-beaked common dolphins can live in aggregations of hundreds or even thousands.

The long-beaked common dolphin can live up to 40 years.

These common bottled-nosed dolphins off the Florida coast are anything but common.

The Mariestopes, you might say, is built in the image of the common dolphin.