By my very patient good friend Janice using her Canon T2 and a EF400mm f/5.6L Lens at 1/3000th of a second. They are snatching gnats out of the air with their long sticky tongues. Gnats make up 60-65% of the juveniles diet in the summer after they are fledged (maybe 2 weeks ago), and the rest is nectar which makes up 35-40%. They need copious amounts of protein to continue their feather growth before migration south:
Life and Wildlife along the Little Buffalo River 
Are you serious? Capturing those in flight–incredible!