I have twice tried to get this video to be accessible, but probably due to my lack of technical skill, only a few people have been able to watch it. Let's try a description:
An adult little blue heron was stalking prey in the Viera Wetlands marsh. As it did so, it started to wave its entire neck and head from side to side, describing about a 120 degree arc. It did this curious motion about 6 times over a course of about 20-30 seconds and then stopped. It really looked like a metronome!
Does anyone have any knowledge of what this bird was doing? One person thought it might be triangulating prey. Any insights would be most appreciated.