It has a long tail, suggesting that it actively swam after fishes and other prey.

They are actively swimming in the water.

The animals get back to the surface by actively swimming and using up their last stores of oxygen.

Only a few species, such as fish, swim actively against the stream.

The fry continue to dwell in the crevices until they are strong enough to swim actively.

The ciliated larvae hatch about 45 hours after deposition and swim actively in the water column.

Small animals are also capable of swimming actively with the aid of their cilia.

The theorem is named for the scallop, the only bivalve able to actively swim distances.

One week after the hatching, the young ruffe start to swim and feed actively, but they do not form schools at this age.

They also lacked a swim bladder and would not have been able to keep afloat without actively swimming.