Actually... YES they CAN! The muscles of their jaws are VERY strong for CLOSING their mouths, but VERY WEAK for OPENING their mouths. This why the average man can hold the croc's mouth closed (once it is already closed) while someone else wraps Duct Tape around the snout, or the person holding the croc's mouth closed can tape it shut.
No. Crocodiles have muscles in their mouths that are extremely powerful, and designed to firmly close. But these muscles cannot exert the same force when opening.
They have extraordinarily strong muscles in their mouth so the second something enters their mouth, even a little bit, they can snap down and eat the little bugger.
The same way we do
Crocodiles are often seen on the beach, looking like they are asleep, with their mouths open. What they are doing is basking, they keep their mouths open to regulate their body temperature. People sweat, dogs and cats pant, and crocodiles open their mouths :)
No. Crocodiles have muscles in their mouths that are extremely powerful, and designed to firmly. When submerging under water, they close their ear and nostril flaps. They have a third eyelid, called the nictitating membrane that protects their eyes underwater.
Crocodiles open their mouths for 2 reasons: to cool off and to let spur-winged plovers get rid of parasites. the cooling is possible because the open mouth has more volume (surface area) for heat to escape.
Crocodiles can't open their mouths if you hold them shut. That's the only weakness I know of. Do you plan on fighting a crocodile anytime soon?
eels must open and cloth their mouths constantly in order to circulate water over their gills
they get birds to clean there teeth and skin
They normally lie with their mouths partly open, and the local birds pick off any bits of flesh from the teeth.
Alan Brunacini
to allow air to enter into enter their body
The temporomandibular joint (TMJ).
No. If they didn't open and close their mouths, water couldn't flow through their body, and then out their gills. Thus, they wouldn't survive.
Both Alligators and Crocodiles do the 'death roll'. All 23 species of Crocodilians can only open and close their mouths, and cannot move them from side-to-side like you or I, so have to do the 'death roll' in order to dismember their prey, as they can only eat their food whole.