A pair of Robins build nest at beam height steel over production center of Calumet Rolling Mill, in Chicago Heights, Illinois.

Nest of a pair of Robins at beam height in Calumet Rolling Mill, in Chicago Heights, Illinois. Eggs in the nest built amidst machinery roars and blasts in kilns nearby. Molten steel bars under processing slide below the nest. A worker shows the ambient temperature ranging from 110 to 125 degree Fahrenheit. One of the birds sits on nest covering its eggs. A worker climbs scaffolds and holds the nest to replace its position to somewhere else.