This comes from the fact that jaguars, much like all of their Panthera cousins, are not picky eaters, but rather opportunistic feeders, which means they can survive on any prey they catch, including reptiles such as anacondas – for this matter, the jaguar is among the few big cats to regularly feed on reptiles. read more
If a jaguar encounters an anaconda, it may fight back in self-defense, however, it would rarely prey on the anaconda due to the size and tenacity of the snake. When and if the jaguar does kill an anaconda, it would do so with bites to the head, neck or throat. read more