The Flying Trilobite: September 2012

I mentioned on Twitter I was drawing a two-headed mutant ammonite.
Here's the discussion.

. @flyingtrilobite's tweet makes me wonder: are there any fossils of two-headed animals?
— Ed Yong(@edyong209) August 29, 2012

@edyong209 @flyingtrilobite Yep. A two-headed reptile hatchling:news.nationalgeographic.com/news/2006/12/0…
— Mary Beth Griggs (@MaryBethGriggs) August 29, 2012

I LOVE SCIENCE AND TWITTER AND THE WORLD RT @marybethgriggs: @flyingtrilobite Yep. A two-headed reptile hatchling:bit.ly/RmKx5s
— Ed Yong(@edyong209) August 29, 2012

@edyong209 See rsbl.royalsocietypublishing.org/content/3/1/81… in Biology Letters - 2-headed champsosaur from China's Cretaceous
— Andrew A. Farke (@AndyFarke) August 29, 2012

@edyong209 If you believe in yourself, one day *you* might be a two-headed fossil, Ed. Make your own dreams come true.
— Glendon Mellow (@flyingtrilobite) August 29, 2012