

I was driving down to Upolu for my usual walk when I saw a few Great Frigatebirds off in the distance. They seemed to be heading my way, so I pulled over and waited. As I did so, more appeared. They glided down towards the coast, then banked left to cross the road, which is when I took these photos.

I counted 17 in all, though there might have been more. Usually, I see these birds in ones and twos, but larger flocks like these are, apparently, not unusual. Such gatherings can be simply social, but can also improve their chances in the search for food, as well as for spotting predators, not that they have a lot of those while flying.

My bird book notes that most Great Frigatebirds seen in Hawaii are females or juveniles, but I regularly see males, which are easily identified by the red gular sac on their throat. This sac can be impressively inflated during courtship.
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