I have an ongoing project to make posts for mental_floss articles I wrote way back when that I do not have an archive for. Here's another one, from 2014.
Our friend from Sesame Street may be a big bird, but he’s tiny compared to some real birds that have roamed the earth in the past. Here are a representative few of these big birds we will never see alive again. In some cases, that’s a comforting thought. Meet them in a list I posted at mental_floss.