To collect eggs, build a 2 room pen (Dino gates work great as walls and dividers). Agro a bunch of TBs and lead them to one side of the pen then trap them in. Lead them back and forth between the sides as they drop eggs.
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