Mysticeti species, or literally baleen whales, form, together with the suborder Odontoceti (toothed whales), the order of Cetacea : whales, dolphins, porpoises, etc. These whales use their baleen plates, specialised hairs inside their mouths, to filter sea water and capture krill (small crustaceans), plankton and fish.
Among cetaceans, only the Odontoceti are able to use ultrasound for echolocation. Mysticeti species such as the grey whale or blue rorqual are incapable of echolocation.
A skeleton of a mysticeti species: the jaw in the foreground does not have any teeth, or even a trace of where these teeth might have been located. © Haitham Alfalah CC by