Dodatkowe przykłady dopasowywane są do haseł w zautomatyzowany sposób - nie gwarantujemy ich poprawności.
Aquatic molluscs such as limpets, which are sometimes out of the water, tend to move using retrograde waves.
Earthworms move by retrograde waves alternatively swelling and contracting down the length of their body, the swollen sections being held in place using setae.
The waves may move in the opposite direction to motion, known as retrograde waves, or in the same direction as motion, known as direct waves.