Octopuses don't have bones, so how do they move?

“Octopuses don't have bones, so how come they can move.” Worms don't have bones either. Neither does an elephants trunk… All can move. The answer is that they all possess physical structures called Muscular hydrostats which is a muscular system without bones. read more

Only vertebrates have bones. Other animals can have hard parts such as beaks or shells, but those parts can never be true bone because it takes vertebrate DNA to make bone. An octopus is not a vertebrate. read more

JANE PAULEY, anchor: On science today, our subject is how muscles work. Science correspondent Robert Bazell has a report on research into what makes us move. Morning, Robert. ROBERT BAZELL, reporting: Good Morning Jane. Now if I move my muscle like that, PAULEY: Wow. read more