On my Birding is Fun post for this morning, I summarized what I have found to be the most useful ways to distinguish between our two waterthrush warblers, Louisiana and Northern. I thought it would be fun to have a waterthrush quiz here (there's another one there too). If you are still learning to distinguish between them, check out the post and then look at these photos. Some of the photos on the BiF post are the same birds in different poses here, so you'll likely get some of the answers just from comparing photos, but this is all just for fun anyway--no prizes. Feel free to include your answers in the comments below.