Snakes of the Vineyard Pssssst, or rather Ssssst, it’s snake time at the Chilmark Public Library. On Wednesday, June 10 at 5 p.m., BiodiversityWorks biologists Luanne Johnson and Liz Baldwin will talk about their work studying snakes on the Vineyard. Did you know the black racer is the Island’s largest snake? You do now, and come Wednesday you’ll learn a lot more.