I brought my sarco to try to kill these things. I just shot them down and the sarco ate them. Easy peasy. If u are in a swamp or by that river at the bottom of the map don’t be afraid if it says “you have entered a dangerous area” most of the time (in that River mostly) it is these guys
those mf can eat a whole bronto in less than 5 seconds, so if you kill anything big and want to harvest its body, make sure to kill them instantly because they spawned near dead bodies or say bye to the body.