 The difference in the hearing ranges for octopus and bigfin reef squids may be explained by the difference in their habitats . The octopus is demersal ( bottom @-@ dwelling ) with excellent camouflage capabilities . Bigfin reef squids , on the other hand , are usually in open water with limited hiding places . Hearing would thus be more important for the squids to escape predators . The ability to hear is particularly relevant for avoiding mammalian predators of the suborder Odontoceti ( particularly dolphins ) , who use echolocation to find prey . 
