They can be used for getting prime meat fresh when doing a tame. Just knock the dino out then use this guy on a nearby dodo or any other small thing and youll have some fresh prime to give to your soon to be pal.
In my opinion this is easily the best shoulder mount. It brings you fish that contain raw prime meat and sending it to attack a Dodo can get you raw prime meat. I have x1.5 harvest rate and got somewhere around 12 raw prime meat from one Dodo. An absolute must have