Choanoflagellate colony courtesy Kayley Hake
Limaçon Trisectrix from 12 Circles courtesy of Roger Antonsen
Sauropod courtesy of Brian Engh — dontmesswithdinosaurs.com
Alternate poster
Carcharodon carcharias courtesy David McGuire
The Brainy Dead courtesy of Rob Sacchetto — zombieportraits.com
Romalea guttata courtesy of Becky Jaffe
Photo of <em>Dumetella carolinensis</em> courtesy Justin Benttinen