Centennial Farm volunteer Julie Gaffney presents a newborn chick to 92nd Street Elementary School students Gonzalo Acuna, center, and David Acedo, during Discovery Day Thursday.

The Centennial Farm and Millennium Barn are open 10 a.m. to 4 p.m. Mondays through Sundays, though they are closed on holidays and during the OC Fair and other all-grounds events.

Centennial Farm Supervisor Allen Mesick holds a pet rabbit at Centennial Farms at the OC Fair & Events Center in Costa Mesa. In March, Mesick will host the Centennial Farm Workshop: Urban Hops ...