The Mexican Pygmy Rattlesnake is one of the most dangerous snakes found in Puebla. Despite its small size, usually ranging from 40 to 60 centimeters in length, it carries a venom that is hemotoxic, meaning it can damage blood cells and tissues. A bite can lead to severe pain, swelling, bruising, and, in serious cases, necrosis around the wound. These rattlesnakes usually inhabit dry, rocky areas, pine forests, and grasslands, where they can remain well camouflaged. They are not naturally aggressive but may strike when threatened or stepped on. Because of their small rattle, they can be difficult to hear, increasing the risk of accidents. Medical attention is always required after a bite, and antivenom may be necessary to prevent complications. Although dangerous, these snakes also play an important ecological role by controlling rodent populations.