These guys are super scary. no matter how powerful you are, always watch out for these guys if you're in or around a swamp. swamps are FILLED with these guys, and when they bite you, they fill your torpor bar up and knock out both you and your mount. DO NOT get knocked out, especially when in a dangerous area like a swamp. if you get bitten, eat a bunch of stimberries and feed them to your mount too. my pteranodon and tapejara and me can take out almost anything we come across (so far), and i'm still terrified of these guys. stay away from titanoboas and other poisonous creatures, even if they're not powerful they'll get you killed. keep at least 50, preferably 100-200 stimberries on you when traveling through, over or near swamps.
If you are near a swamp you will eventually run into one of these. Make sure to have stim berries in your hot bar for escaping these monsters. They quickly counter the poison so you dont pass out and become easy prey