These things are weak so use darts since it does less damage, easiest way to knock it out is to watch it until it comes down to steal your stuff then bola it head on. Worked every time for me. Also force feeding it a little meat will keep it from dying, that's what happened with me. Hope this was helpful.
Similarly to real life, these greedy douchebags will try to steal your sandwiches, however if you are drunk enough, you can stay up into the late hours of the evening and have deep insightful conversations with these feathered friends as they simply stare at you in confusion and bark in bird language. In return they will bring you magical fish as a reward.
You have to tame a high level because it would have so little health you would kill it by accident. I would use a long neck to knock it out and probably 10 bolas because they are pretty hard to hit. Up if this helped.
They need to make it so that if you put narcos bio toxin etc in ur last hot bar a lot the icthyornis will eat them and get knocked out(like putting berries in ur last hotbar slot to tame the pego, but instead of taming it will be knocked out)
These annoying flyers can be used to aid in taming otters. Just set the hunt and retrieve feature on it, make it attack a fish, and as it comes back to you grab the fish and walk up to the otter and press the button to tame. Otters are quick tames, and provide insulation from both the heat and cold which directly depends on their melee stat. They can also hold multiple artifacts in their inventory. Can be found in shallow rivers.