Celebrate Earth Day a few days early with all things butterflies, including a butterfly release, butterfly garden, and a special showing of "Flight of the Butterflies" in 3-D.
Fri., April 19, 10am-4pm. 0-2 years old, free; ages 3-18 (or with student ID), $9.50; adults, $11; seniors (65+), $9; military, $5.50.