Skates, members of the ray family, lay the fertilized eggs, while other rays ’ eggs are hatched within the female and the young are born alive — miniatures of their parents.
Railiste seltsi kuuluvad railased munevad viljastatud mune, teised railised aga hauvad mune enda üsas ja sünnitavad elusaid järglasi, kes on nende miniatuursed koopiad.