A bioblitz is a 24-hour species inventory. Every year National Geographic partners with a different National Park to hold a bioblitz. School groups, scientists, citizen scientists, photographers, and families descend on the park to identify and count as many plant, animal, and fungi species as possible. This gives an estimate of the current state of the park's biodiversity.
Can't make it to NoLa? Hold your own neighborhood bioblitz. It'll make for a great end-of-the-school-year outside activity for your students.