Hi there! Just wanted to share a quick tip for mobile players!
So basically these birbs are kinda bugged on mobile so you can't shoot at them with tranqs whenever they're on trees. So I suggest y'all to simply wait for them to get on land and then shoot them (One tranq dart is enough, normally), or you can just bola one then shoot it. Just keep in mind that you just CAN'T shoot them while they're on trees.
Thanks for reading, and I hope you've found my tip useful!