HomeGlossary Birding slang Life list A running list of every species a birder has seen. Online tools such as eBird keep life lists automatically from your checklists. Birding slangRelated termsFull glossary Twitch To travel to see a rare bird found by someone else; a twitcher is someone who does this. LBJ Short for "little brown job": a small brown bird that is hard to identify. Lifer A species you see for the first time in your life. Big Day An attempt to record as many species as possible within one calendar day. Dip To miss a bird you went looking for. Vagrant A bird found far outside its normal range.