We’re not sure WHY these people would pursue a prehistoric monster – and then grab it by the tail just for the heck of it.

What looks to be one of the biggest anacondas ever caught on tape was recently seen by a few people on a boat in Brazil, and yes, this thing is massive.

Adding to the snake’s size was the giant meal it had apparently just eaten, considering how there was a giant bulge about the size of a pig in its abdomen.

But again, why the hell would you mess with this thing?

Watch: