520 ILCS 5/2.3: Release of Wildlife - Permission.

It shall be unlawful to release from captivity any live bird or mammal, either indigenous or non-indigenous in this State and that is ordinarily considered a wildlife species except as provided in Sections 2.2, 2.4, 2.34, 2.37, 3.23 and 3.29, anywhere in this State without first securing the written permission of the Department to do so. The Department may set forth applicable regulations by administrative rule.