Union County Freeholders Angel G. Estrada (C) and Bette Jane Kowalski listen as Joe Filo, a senior naturalist with the Union County Trailside Nature and Science Center, speaks about tiny wildlife in Esposito Park in Clark during "Bio-Blitz 2010."

Bio-Blitz is a 24-hour sampling of the flora and fauna in a particular location with the twin goals of studying the biodiversity of the area and making the public aware of that diversity.