as title says there is 1 guaranteed spawn of the bird each mission i found. Takes 5 minutes to do and can save time trying to get those 5 common. I have done and gotten this multiple times in a row so pretty sure its guaranteed.
pictures and location https://imgur.com/gallery/WNXGAMZ
So from map i could find (not at home) there should be a conservation at the white circle for the bird. It will then take to the red citcle inside a cave with orange overgrowth on top. Once u got your lure and did the step 2 the bird will spawn outside the cave above you. Usually at the enterence outsid