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Part of why we’re so fascinated with extinct dinosaurs it’s just hard for us to believe that animals that huge actually existed. And yet, they existed! From the Jurassic to the Cretaceous Periods, creatures as tall as a five-story building were shaking the Earth.

Thanks to Nathan E. Rogers, Julio Lacerda, Franz Anthony and Studio 252mya for their illustrations. You can find more of their work here: https://252mya.com/licensing

Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios

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References:
http://www.pbs.org/newshour/rundown/massive-titanosaur-biggest-dinosaur-ever-found-squeezes-into-museum-of-natural-history/
http://www.bbc.com/earth/story/20160201-meet-the-most-massive-dinosaur-to-ever-stomp-the-earth
http://phenomena.nationalgeographic.com/2015/01/21/how-paleontologists-uncovered-the-worlds-biggest-rhino/
http://phenomena.nationalgeographic.com/2015/07/14/the-largest-beasts-to-walk-the-earth/
https://www.google.com/url?q=https://www.researchgate.net/publication/51920950_Reproductive_Biology_and_Its_Impact_on_Body_Size_Comparative_Analysis_of_Mammalian_Avian_and_Dinosaurian_Reproduction&sa=D&ust=1500399844630000&usg=AFQjCNGTT_rSvT7liO9z1Pp6D5VCDsXKyw
http://www.bioone.org/doi/abs/10.1666/0094-8373(2003)029%3C0243:VPASAT%3E2.0.CO;2
https://www.edb.utexas.edu/petrosino/Legacy_Cycle/mf_jm/Challenge3/Avian%20Respiration.pdf
Wedel (2009) on air sacs
https://www.researchgate.net/publication/51920950_Reproductive_Biology_and_Its_Impact_on_Body_Size_Comparative_Analysis_of_Mammalian_Avian_and_Dinosaurian_Reproduction
https://www.nature.com/news/dinosaur-family-tree-poised-for-colossal-shake-up-1.21681