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.
Of the 120 species of snakes in the USA, only 17 are a potentially hazardous to humans. These snakes are not poisonous, rather they have venomous saliva which is injected when they bite. It is important to identify snakes that belong to the venomous group.