Bloodwing's Enclosure is an area in Borderlands 2, inside the Specimen Maintenance zone in the Shipping Yard
You get sent there in the mission Wildlife Preservation to rescue Bloodwing
Walkthrough
Once you enter, head towards the waypoint and grab Bloodwing's Feather
Handsome Jack tells you he has moved Bloodwing Somewhere lse
Mordecai reports he is seeing some commotion in the Observation Wing and suggests she might be there.