Mobula is a genus of ray in the family Myliobatidae (eagle rays). Their appearance is similar to that of manta rays, which are in the same family. Species of this genera are often collectively referred to as "devil rays", "flying mobula" or simply "flying rays", due to their propensity for breaching, sometimes in a spectacular manner. The devil fish can attain a disc width of up to 5.2 m (17 ft) and can probably weigh over a ton, second only to the Manta species in size. Despite their size, little is known about this genus, much of it being from anecdotal accounts.