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The word is derived from the combination of ferruginous and concrete.
It has a broad ferruginous breast bar above a white belly.
This turned the water orange, and deposited ferruginous sediment along the canal.
The underside of the body and wings is ferruginous speckled with black.
The legs also vary from black to ferruginous.
The first source of chalybeate (ferruginous) water was found in May 1705.
Soil in the western slopes is a ferruginous red, sandy loam.
Those to the north are mostly shallow and ferruginous, brown or brownish red in colour.
The "Ferruginous" name refers to the rusty color of the light-morph birds.
The name means "where the earth is red", referring to its iron-bearing (ferruginous) soil.
Ferruginous Hawks have been known to live for 20 years in the wild, but most birds probably die within the first five years.
The forewings of the typical form are ferruginous in colour.
The basal area is ferruginous mixed with a few pale-gray and white scales.
The head is scaled in grey-white mixed pale ferruginous scales.
The periostracum is thin and covered with a thick ferruginous deposit.
The forewings are pale to dark chocolate brown, interrupted by ferruginous parts.
The extent of ferruginous markings is variable.
In places the sandstone may be conglomeratic or ferruginous.
Its geological composition comprises limestone capped with a very hard ferruginous layer of rock.
In savanna areas, with altering dry and wet climates, ferruginous soil occur.
Zones with highest aluminium content are frequently located below a ferruginous surface layer.
The remains of the tower are in ferruginous conglomerate, and the porch is built in brick.
The head and thorax are ferruginous cream.
So do the ferruginous hawks.
Ferruginous Hawks nest in trees if they are available, including riparian strips, but the presence of water does not appear to be critical to them.