When I was in Brazil last year, I spent half a day scaling the side of a cliff, following my guide to the nesting site of green-winged macaws. Not much materialized as we waited patiently on top of the cliff for the birds to return home for the night. Finally, we saw this lone pair flying well below us in the valley. Not exactly the photo opportunity I was expecting but pretty cool to watch as they glided above the tree tops  Green-winged macaws — also known as red and green macaws — are the largest of the macaws and they range throughout northern and central South America. Once fairly common, they are now faced with rapidly declining numbers due to habitat loss and illegal capture to the parrot trade.