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.
(A subspecies is a geographic race of a species.) The five species of venomous snakes found in the state include the Osage copperhead, western cottonmouth (water moccasin), western pygmy rattlesnake, massasauga rattlesnake and timber rattlesnake.