However even 18 hours is not considered abnormal for a Chihuahua. This includes naps.There are 2 types of sleeping. One is a lighter sleep (called slow wave) and the other is the deeper sleep (known as REM-Rapid Eye Movement). Dogs, just like humans do have these 2 different types of sleep.
Probably the best known snake in the world, the Rattlesnake is a pit viper found almost everywhere in the United States, and is capable of a deadly bite. Its trademark rattle strikes fear into anyone who hears it.
The only venomous snakes on this page are the Cottonmouth and the Rattlesnakes and should be left alone. All the others on this page are considered harmless to humans. Watersnakes, racers and a few of the other non-venomous snakes will bite if cornered or handled, but if given the chance will just try to go away from you.