People of all ages are invited to take part in the annual butterfly count Saturday in Oldham County.

Results will submitted to the North American Butterfly Association for its national census. 

The local count has been conducted at University of Louisville’s Horner Wildlife Sanctuary since 1976, led by biology professor emeritus Charles Covell.

“We break up into teams of appropriate size, and one person is a recorder and we call out the number of each species we find.  In other words we call off the name and then add to the number and then we add all the numbers together at the end of the day,” Covell told WFPL from Gainesville, Florida, where he's a curator for the McGuire Center for Lipidoptera and Biodiversity

Covell says the census is important.   The information helps scientists keep track of butterfly species in different regions, and how their numbers are being affected by environmental factors such as climate change.

The local census has recorded 70 different kinds of butterflies over the years. 

Rick Howlett is host of WFPL's weekly talk show, "In Conversation."