One hundred years ago this Monday, the only Passenger Pigeon left on earth cooed her last. Martha, as she was known to her adoring public, died at the Cincinnati Zoo on Sept. 1, 1914 after spending nearly all of her life there. She spent her final years alone as an aging spinster with no hope for baby pigeons of her own—most male pigeons had kicked it by then and Passenger Pigeons didn’t really get it on in captivity, anyway. Once numbering in the billions and pervasive throughout the country, Passenger Pigeons went extinct in the start of the 20th century, following voracious hunting by humans. Today, Martha’s memory reminds us that just because you can kill 50,000 birds a day doesn’t mean you should. To remember Martha and her fellow brethren, check out these interesting facts about her life and her species. We also give you with some ways to commemorate the day. 1. Martha was named in honor of our very first First Lady—Martha Washington. 2. During Martha’s...