This is a description of Swainson's hawks, a species of hawk found in North America. These birds have a wingspan of up to four feet and are primarily brown in color. They are found in open grasslands and prairies, where they hunt for small mammals and insects
From Wikipedia
Swainson's hawk is a large bird species in the Accipitriformes order. This species was named after William Swainson, a British naturalist. It is colloquially known as the grasshopper hawk or locust hawk, as it is very fond of Acrididae and will voraciously eat these insects whenever they are available.