Why are those snakes called cottonmouths?

Answer 1

No, it is not. It is poisonous.

No, but both are in the pit viper subfamily, Crotalinae.
No, however it is in the same family (pit viper, meaning they have "holes" on both sides of the face between there eyes and nostril (these are where they get the term "pit" in pit viper, the viper part comes from the way there fangs are designed, they fold back in the mouth and "spring" open and forward when they are in the act of biting) . These snakes are also cousins of the copperhead.

Answer 2

_Agkistrodon piscivorous_, also called the water moccasin (and often confused with harmless watersnakes of the genus _Nerodia_; young ones may also be mistaken for the closely related copperhead, _A. contortrix_), is known for its gaping defensive display, in which it shows off the white lining of its mouth, hence the common name "cottonmouth." It is native to the southeastern United States, ranging from southeastern Virginia through the coastal plains of the Carolinas, southward through all of Florida and west through much of Georgia and along the Gulf Coast as far as eastern Texas and Oklahoma; in the western part of its range, the cottonmouth can be found as far north as Missouri and southern Illinois and Indiana.

Answer 3

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

Answer 4

No there is only the cottonmouth and the rattlesnake. They both live in the U.S

Answer 5

The cottonmouth is a pit viper related to the rattlesnakes but is not a rattlesnake.

Answer 6

its a snake but not a rattlesnake