On Saturday, May 9, it’s that time again. Global Big Day will be held worldwide. An international day, organized by Cornell Ornithology Lab, on which thousands of people go out into gardens and nature reserves to search for land and water birds to count them. This takes a snapshot of bird diversity and density around the world with everyone active on the same day. All counting data is entered on the eBird website, www.ebird.org, creating a massive database of bird diversity.