Bitterns can look like a football with a head attached so it always amazed me when they’d stand and stretch their necks up, and up, and up. Useful for seeing over tall grasses and also as a defensive pose, I saw them do it multiple times when bald eagles soared high overhead, although the subterfuge worked best when the grasses were brown instead of green. I was never quite sure how they distinguished the distant eagles from other birds of prey but I did a quick check of the skies if a bittern I had been watching suddenly struck a thin vertical pose.
Boolie 