Rattlesnakes are a group of venomous snakes found primarily in the Americas. They are easily recognized by the distinctive rattle at the end of their tails, which they use as a warning signal to potential threats. Rattlesnakes belong to the Viperidae family and are known for their heat-sensing pits, allowing them to detect warm-blooded prey even in the dark. These snakes inhabit a variety of environments, including deserts, forests, and grasslands. Rattlesnakes primarily feed on small mammals, birds, and sometimes reptiles. They play an important role in their ecosystems by helping to control rodent populations, making them valuable to the balance of nature.