Modifies a noun

• pygmy-owl: We soon solved the mystery for there was a fine Ferruginous Pygmy-Owl in all its glory.

• duck: The sun shone on a group of 26 ferruginous duck flying passed the boat.

• buzzard: For their body size, Ferruginous Buzzards have relatively small feet, which limits the size of prey that they can catch.

• flycatcher: We also located several more Ferruginous Flycatchers, but the audible Oriental Cuckoos always remained distant and out of sight.

• hawk: Golden eagles and ferruginous hawks have nested in the vicinity of Downey Lake.

• mineral: These sands display a wide range of colors, because of the ferruginous minerals.