Ranging from eastern North America to as far west as Texas, Oklahoma, and Kansas, the timber rattlesnake is the only rattler species in the populous northeastern United States and is considered endangered or threatened throughout much of that region. Found mostly in woodlands, timber rattlers prey on rodents, birds, insects, and amphibians and are known to hunt during daytime in spring and autumn, then switching to nocturnal hunts in warm weather. The snake’s highly toxic, and relatively complex, venom, long fangs, and high venom yield make it potentially one of America’s most lethal serpents. However, timber rattlers are generally considered shy and nervous and are quick to seek shelter when encountered afield. The species tends to rattle and feint extensively before striking, though it will stand its ground if harassed.