They are very territorial. I once (on a canoe trip) saw two birds really going at each other over…a piece of red flagging tape.I watched the hummingbirds for a long while - boy were they aggressive defending the nectar. I could hear them clashing mid air and seemingly “shouting” at each other.
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Today I made my train reservations for me and my canoe. We will be dropped off at a lake in the middle of nowhere!