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.
Coral Snake. For venom power, the most dangerous is the cousin to the cobra called the coral snake. These snakes live in the southern part of the United States, stretching from Florida to Arizona. They are small snakes, measuring 39 inches or less. Their fangs are undersized, so many coral snakes are unable to penetrate skin.