If you see a bird chasing another bird, it may be evicting a nest-robbing species. But chances are that it's chasing another of its own species. Many of Natures Creatures are territorial, an instinct that limits overpopulation and inbreeding. Once they select a nesting site, they protect and defend the surrounding area from others of the same species. Yet they ignore most other species nesting within "their" boundaries.
Deer have been known to lock antlers and die of starvation in their effort to maintain the vitality of the species. And mere birds will test the strength of feathered intruders with "tooth and nail" to the point where they are both grounded, too tired to continue.
This Indigo bunting saw his reflection in the rear-view mirror of a van. For days, he sat on the mirror or a nearby tree limb. Then he would look into the mirror to see if his territorial defense was successful, and launch yet another attack when he learned that his imaginary rival was still in the mirror.
This Mockingbird was similarly provoked by his reflection. But he was often launched into attack by his reflection in the roof as well as his reflection in the side window. However, he always attacked the window; never attacking the image in the roof.
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