When courting a female, the male cardinal will feed her sunflower seeds to win her affection. The male cardinal is also extremely defensive of its breeding territory. Upon seeing its reflection in glass surfaces, the bird has been known to spend hours fighting an imaginary foe.

Known for its durability and resistance to exposure, limestone is especially popular in architecture and has been used to build many landmarks around the world. The Tribune Tower, U.S. Department of Commerce and the Empire State Building, are all made of Indiana limestone.

The tulip tree is the tallest hardwood tree in eastern North America. It can grow taller than than 100 feet and live for 150 years.

Flowing uninterrupted for 411 miles, the Wabash River is the longest stretch of free-flowing river in the United States east of the Mississippi River. It is also the subject of the state song, "On the Banks of the Wabash, Far Away," by Paul Dresser.

Ants are attracted to the sweet nectar produced by the peony. The ants are harmless to the flower, and many people believe that they return the sweet favor by defending the peony from harmful insects.