It called a Robin because its breast is red, even though it is not related to the European Robin. It is called American because it is found in America. (Similarly birds like Magpie Larks and Magpie...
It was probably a territorial or food dispute between two males.
Robins eat insects, worms and seeds they find around. They love night crawlers
........ Firstly, Americans are not food. Secondly food IS food. Thank you for your cooperation.
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