Cephalopods are fast-moving, voracious predators, and can change colour with breath-taking rapidity. They range from the giant squid, the world's largest marine invertebrate, to species of only 2 cm in length. Inhabitants of most seas of the world, they are found from the surface to great depths. Most cephalopods have short lives yet their efficiency in capturing and consuming prey ensures rapid growth. These animals possess highly-developed nervous systems, large brains, elaborate senses, complex behaviour and are capable of learning. Many of these features are described and illustrated with line drawings and photomicrographs.The deep-living vampire squid, Vampyroteuthis, is uniformly black and as its chromatophores lack muscles it is not likely to undergo ... Coleoids of open waters do not show the varied chromatic patterns found in the coastal-water forms. ... In many oegopsin squids most of the photophores are on the ventral surface, and are often numerous below the eyes. ... Log-log plots of brain and body weights of adult cephalopods are compared with those of higher and lower vertebrates (birds andanbsp;...
|Title||:||The Brains and Lives of Cephalopods|
|Author||:||Marion Nixon, John Zachary Young|
|Publisher||:||Oxford University Press - 2003-09-04|