Their flattened bodies offer very little resistance to the water. Wavelike movements of their fins give them the power to glide through the sea as if flying effortlessly.
Plakanais ķermenis ļauj ievērojami samazināt ūdens pretestību, un, viļņveidīgi kustinot spuras, rajas viegli un brīvi it kā lido ūdenī.