5 ILCS 490/10

The last Friday in April of each year is designated as Arbor and Bird Day to be observed throughout the State as a day for planting trees, shrubs, and vines about the homes and along the highways and about public grounds within this State and for holding appropriate exercises in the public schools and elsewhere to show the value of trees and birds and the necessity of their protection, thus contributing to the comforts and attractions of our State.