I've always called this the tickle monster. They're surprisingly sneaky, they have a pretty good DPS, and they're also amazing resource collectors. If you encounter one in the wild and get too close, you're basically dead. Tread carefully and watch your back.
To get wood, use normal attack which is slashing with claws. To get berries, use bite attack. To use bite attack on mobile, change multi tap to alt attack 2 and tap with 2 fingers when riding the Therizinosaur. To get fiber, use the tickle with claws move. To use the tickle with claws move on mobile, jump when riding the Therizinosaur.