If by 'swimming' you mean propelling yourself in or through the water, we know nothing of it.

Imagine the spray in your face as a 150-horsepower outboard engine propels you through the water.

It probably propelled itself through the water with its long hind legs and flexible tail.

To propel myself through the water, I was using my arms like paddle wheels, pushing each one straight down and back.

The undulation of this fin propels the fish through the water.

They propel through the water with powerful tail strokes.

They have snorkels on their heads, which are used to propel them swiftly through the water.

His large feet help propel him through the water like flippers.

The unknown creature was using giant fins which propelled it through the water.

They use their fins to propel themselves through the water in this swimming motion.