Moves in large groups. Flies out in mass in the morning and comes back at night but I can never find out where they go to or where they come back to. Maybe some kinda blackbird. The yellow is quite noticeable when they fly. Taken just north or Puerta Vallarta, Mexico.
A species of icterid. I'll check it out when I get the relevant book in 4 days.
Resin
Looks like: Yellow-Winged Cacique (Cacicus melanicterus)
http://www.puertovallartatours.net/images/hiking/Puerto_Vallarta_Birdwatching.pdf
Thanks thebestmissy - that's it! Great website too. Thanks.
Ditto to Yellow-winged Cacique
Resin
