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.
Pit Vipers. Two large pit vipers occur in South America: the bushmaster (Lachesis sp.) and the terciopelo (Bothrops asper). Bushmasters are the longest venomous snake in the western hemisphere, reaching 11 feet or more in length; only the king cobra (Ophiophagus hannah), an Asian species, is longer. Bushmasters are somewhat heavy-bodied, and average 8 to 12 pounds.