Octopuses and squids have beaks. The beak is made of keratin – the same material that a bird’s beak and our fingernails are made of.
100 Mind-Blowing Squids Facts
Octopuses don’t have tentacles. They have eight limbs, but they’re arms (for most species). Technically, when talking about cephalopods (octopuses, squids etc), scientists define tentacles as limbs with suckers at their end. Octopus arms have suckers down most of their length.
Octopuses have three hearts. Squids do too. One pumps blood to the whole system, and two are dedicated just to the gills.