Woops, Back to 499?

My ID of the Balmorhea jaegers as Parasitic may have been premature. Martin Reid, who knows his seabirds, thinks they are Pomarine Jaegers. He based this on bill size and general jizz. I did think the bill looked a bit large even from a distance. Unfortunately Martin only got distant looks like I did. Hope someone else can get a better view.