Occasionally one will fly away from the sea and onto a hill. But rarely. Try to wind up a bola and throw it at one when it is directly above your raft hit it with a club is ok or tranqs are better. Note: they don’t eat meat but they can eat fish meat and need a few narcotics to tame.
You can tame this pretty easily by finding one and waiting for it to land, then just bola it and knock it out with your fists or a club, I reccomend first crafting a club because it might escape from the bola before its knocked if you use your fists. Once you’ve knocked it out, put raw fish meat in its inventory, with a few, maybe 20-30 narcoberries and force feed it those when it’s torpor gets low.