It really depends on what it is doing. If it is going for a crayfish or frog it may go underwater but just swimming, they glide just under the surface with their nostrils in the open.
land...
they can sleep in the sea water or they can sleep on land
They either sleep on land or in the water.
Cottonmouths live where there are lots of prey
Columbus Cottonmouths was created in 1996.
Alligators sleep can sleep on land or they will go in shallow water they sometimes have their mouth open because thats how they sweat
Cottonmouths reproduce sexually. The female's eggs are fertilized by the male.
No the sleep like this they sit down and tuck there face in their back under one wing they sleep on land and water
Growing up in the South you are taught from the time you are small to watch for these snakes esp. when you're near water - they are very poisonous and have a nasty temper. They have dark bodies (which blends easily into the landscape) but when they open their mouth it is as white as cotton - i.e. cotton mouth moccasin
Cottonmouths (Water Moccasins) are commonly found along the Mississippi River. Other species include Northern watersnakes, Garter snakes, and Rat snakes. Some non-venomous species like the Broad-banded water snake also inhabit this area.
Platypuses sleep in burrows that are accessible from the banks of the creeks that they live near and in. These burrows can be from about 20 to 100 feet in length.
They make nests out of water and sleep there. They can eat on land or water. they spend most of the day in water. They breathe via a respiratory system.
I dnt know