According to herpetologist Frank Indiviglio, the largest documented prey that a snake has ever consumed was a 130-pound impala. The snake in question was an African rock python, and it was caught in the act of swallowing the large impala by a camera crew.
It is possible that snakes have eaten even larger prey. The largest snakes in the world live in inhospitable places, such as Southeast Asia, Africa and the Amazon Basin, which are hard to study. The impala may simply represent the largest prey documented, not the largest prey ever consumed. Other large prey have included crocodilians, capybaras and small humans.