Rufous-tailed hummingbirds and white-naped jacobins were the two commonest hummers in Gamboa, Panama.   Both species swarmed aggressively around the feeders we set out, and were very easy to photograph -- aside from their quick reflexes and high speed.   The sitting bird at the bottom was photographed in Tatama National Park, Colombia.

• Canon 30D or 7D2; flight shots were made with a Canon 100-400 zoom at about 300 mm, fill-in flash at high-speed synch setting; sittings bird were shot with a 500 IS lens plus 2X converter and extension tubes or 800 mm IS lens plus 1.4X converter; fill-in flash (2006, 2015)