Dusky or Sand Flathead and Stingrays
Stingrays live on the sea bed. They blend in with sand.
No, hippos live in rivers.
they live in the sea or on the land it depends what type of creature they are
in very rocky places or in the sea on a sea bed
Turritopsis can live forever if left unharmed.
Victor placed the torn remains of the female creature in a box and left it on the bed in his apartment.
cockles live at the beach and they are a type of shell that can sometimes have a sea creature living in them
A made up creature made by Baily on The Suite Life On Deck to get London to give her bed back.
marine is a sea creature and a ocean animal is an animal that live under the sea
The kraken
Tube worms which live near deep sea hydrothermal vents
Not sure if this is the "sea creature" you refer to, but Parrotfish are known to exude a mucous "cocoon" of sorts to sleep in. Apparently it either disguises their scent or is just plain distasteful to nocturnal predators such as moray eels.