ferruginous

Adjective

Meaning

Partaking of iron; containing particles of iron.

Resembling iron rust in appearance or color; brownish red, or yellowish red.

Source: Webster's dictionary

bay cardinal auburn carmine roan rusty bayard henna russet sorrel bronze brass tin ferric hepatic

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black gray dark neutral obscure pale

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I would say this is a Ferruginous Hawk. Source: Internet