Although robins are pretty small, they defend their territory with all the possibilities they have. In our human world we call it 'aggressive behavior'.
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Mother Nature has created some magnificent creatures, and you seem to be able to capture them at just the right moment so that we can enjoy. Very well done, composition is terrific. Wonderful colors and detail, bravo.
Brushing his feathers would do no harm, I think. :) Otherwise nice and orderly bird. Aggression - typical of smaller species and breeds - like with dogs - the smaller the louder and more biting one. LOL SAM & SAAB