65 ILCS 5/11-54-1

This tax shall be based on the gross receipts derived from the sale of admission tickets, but the tax shall not exceed 3% of the gross receipts. No municipality may impose a tax under this Section, or impose any other amusement or exhibition tax, on ticket sales, membership fees, or any other charges for attending exhibitions or attractions associated with a zoological park authorized under Section 40 of the Cook County Forest Preserve District Act, nor may any municipality impose a duty to collect a tax under this Section, or any other amusement or exhibition tax, on any owner or operator of a zoological park authorized under Section 40 of the Cook County Forest Preserve District Act.