These birds are increadibly useful for gathering prime fish meat, all you need to do is tame one and whistle attack on sabertooth salmon and it will bring it the corpse back. Then you can harvest it with a metal sickle and you will get lots of prime fish meat.
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