Locomotion is not the same as movement.

All animals move, but locomotion involves moving from one place to another.

Locomotion increases the animal's success in foraging, reproducing, escaping predators, or leaving unfavorable habitats.

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In passive locomotion, which is the simplest and most energy efficient, transportation is provided by wind or waves.

Active locomotion requires an expenditure of energy to overcome negative forces such as friction, drag (resistance) or gravity, and the body design of animals has evolved to consume the least amount of energy when moving.

Terrestrial locomotion:

includes walking, running, jumping, and crawling, and involves the animal expending energy to overcome inertia or gravity and maintain balance.

For balance when walking, bipedal animals put one foot on the ground, while quadrupedal mammals put three feet on the ground at any one time.

Aerial locomotion - flight and glide

Is typical of insects, birds and bats. And it was of the pterosaurs (flying reptiles extinct millions of years ago)

The challenge for flying animals is to overcome gravity and air resistance. Energy expenditure is reduced to a minimum thanks to the shape of the wings, which maximize the use of air currents to remain in suspension.

Aquatic locomotion - swimming and floating

Requires overcoming the resistance of the water. Fast swimming animals benefit from a fusiform body, tapered at several ends.

The efficiency of these modes of locomotion has been analyzed by comparing their relative energy expenditure. It was found that, energetically, swimming was the most efficient mode