On 6 October, more than 17,000 birders around the world went birding together for the first October Big Day. Reporting from 146 countries, teams tallied 6,136 species of birds: more than half of the world’s birds in a single day. eBirders added 21,149 pictures to their lists, photographing 2,356 species in these 24 hours. This sets new heights for a single day of October birding. Read more.