For decades, scientists believed dinosaurs were diurnal and tiny mammals were nocturnal. But as researchers have uncovered more mammalian fossils and studied the biology of different dinosaur species, they’ve found some surprising results. Thanks to Ceri Thomas (https://alphynix.tumblr.com/), Julio Lacerda (https://twitter.com/JuliotheArtist), and Nobu Tamura (http://spinops.blogspot.com/) for their excellent reconstructions featured in this video. Produced by Complexly for PBS Digital Studios Super special thanks to the following Patreon patrons for helping make Eons possible: Joseph Spencer, Avery Sanford, Mary Tevington, Bart & Elke van Iersel - De Jong, Kip Obenauf, Jack Crissy, Jules Martineau, William Craig II, Tracey, Hizrihel Alkawa, James Dowling-Healey, Irene Wood, Derek Helling, Freddie & Brooks, WilCatRhClPPh33, Mark Talbott-Williams, Elizabeth Baker, Jake Myers, Eddy, Angel Alchin, salsablog.band, Eric Roberto Rodriguez, Hillary Ryde-Collins, Frida, Yu Mei, Dan Ritter, faxo, Jayme Coyle, Patrick Wells, Aziza Ashling, GrowingViolet, Stephanie Tan, Nick Ryhajlo, John Pollock, Ben Cooper, Leonid, Robert Noah, Matt Parker, Heathe Kyle Yeakley, Jerrit Erickson, Anton Bryl, MissyElliottSmith, Zachary Spencer, Stefan Weber, Andrey, Ilya Murashov, Merri Snaidman, Gabriel Cortez, Marcus Lejon, Robert Arévalo, Todd Dittman, Betsy Radley, Anthony Callaghan, Philip Slingerland, John Vanek, Eric Vonk, Henrik Peteri, Jon Monteiro, James Bording, Miles Chaston, Michael McClellan, Jeff Graham, Daisuke Goto, Gregory Kintz, Chandler Bass, Tsee Lee, Robert Hill If you'd like to support the channel, head over to http://patreon.com/eons and pledge for some cool rewards! Want to follow Eons elsewhere on the internet? Facebook - https://www.facebook.com/eonsshow Twitter - https://twitter.com/eonsshow Instagram - https://www.instagram.com/eonsshow/ References: https://docs.google.com/document/d/1dgRv9os0XRq4KCqDs0J1g24jbZTo5D7-0GKDOLkHjj0/edit?usp=sharing