Military pilots initiate sessions of head-to-head aerial combat training with that simple phrase. It seems appropriate for this picture of two hummingbirds who are about to begin a duel over who maintains control of a local area.
Captured Sunday in Pike National Forest (Colorado), these two went at it dodging and darting with each trying to gain the upper hand and drive the other off. Lots of fun to watch, very hard to follow and get a picture of.
