What is the name of the culture cultivated in the area of Duncan Farm and Golden Eagle?
Hopewell tradition
Title: Duncan Farm (Grafton, Illinois)
Passage: Duncan Farm is an archaeological site located on a farmstead south of Illinois Route 100 in Jersey County, Illinois, near the city of Grafton.  The site, which dates from the Woodland period, includes two burial mounds and a habitation site.  The site was part of the Hopewell exchange system in Illinois and is the closest neighboring village site to the Golden Eagle regional transaction center, a major trade and social hub in the system.  Archaeologists have suggested that the site is a local transaction center in the Golden Eagle site's region due to its two large mounds, which are roughly 200 ft long and 100 ft wide each.  In addition, the site is archaeologically significant due to its distinctive stratification, which allows its artifacts to be easily dated.
Title: Hopewell tradition
Passage: The Hopewell tradition (also called the Hopewell culture) describes the common aspects of the Native American culture that flourished along rivers in the northeastern and midwestern United States from 200 BC to 500 AD, in the Middle Woodland period.  The Hopewell tradition was not a single culture or society, but a widely dispersed set of related populations.  They were connected by a common network of trade routes, known as the Hopewell exchange system.
Title: Reproduction and life cycle of the golden eagle
Passage: Golden eagles usually mate for life.  A breeding pair is formed in a courtship display.  This courtship includes undulating displays by both in the pair, with the male bird picking up a piece of rock and dropping it only to enter into a steep dive and catch it in mid-air, repeating the maneuver 3 or more times.  The female takes a clump of earth and drops and catches it in the same fashion.  Small sticks may also be used in this display.  Compared to the bald eagle, golden eagles do not repeat courtship displays annually (which is believed to strengthen pair bonds) and rarely engage in talon-locking downward spirals.  Golden eagles typically build several eyries within their territory and use them alternately for several years.  Their nesting areas are characterized by the extreme regularity of the nest spacing.  In 9 studies of annual nest spacing, the average minimum distance between nests range from 16 km apart in Norway to 8 km apart in Switzerland.  Nests in Scotland may found at anywhere from 10 to 65 pairs per 1000 km2 , with an average of over 20 pairs found per area.  In much of continental Europe, densities of less than 10 pairs per 1000 km2 are typical.  In the United States different areas had from 10 to more than 20 pairs on average per 1000 km2 .  Wyoming had the greatest densities of breeding golden eagles of any complied study, though numbers were comparable to western Scotland as there were an average of just over 20 pairs per 1000 km2 , with greatest estimated densities of possibly 125 per area.  In Wyoming, the distance between nests ranged from 3.1 to , averaging 5.3 km .  In the wooded peatlands of Sweden and Belarus, a maximum of 5 pairs appear to occur per 1000 km2 .  In Quebec, the distance between nests ranged from 8 to .  In the Snake River canyon in Idaho, nests are 5 to apart, while two other nearby studies in Idaho found the average distance were 4.3 km and 4.39 km , respectively.  The nesting density for a breeding population near Livermore, California, and the Altamont Pass Wind Farm is among the highest in the world for golden eagles, with at least 44 pairs in 1997, a density of one pair per 19 km .  Due to the consistency of use by golden eagle pairs, population densities change generally happens only quite gradually.
Duncan Farm (Grafton, Illinois) Hopewell tradition