Warm Blood Crocodiles The Endothermic Ancestry of Crocodilians Part 1 The Evidence

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Like most other reptiles, crocodilians have a low metabolism. Commonly referred to as “cold-blooded”, they are reliant on the external environment to maintain their body temperature. Among other things, this means they are not able to be as active as warm-blooded animals, who generate their own body heat. However, this was not always the case. Like their more famous cousins, the dinosaurs, the ancestors of the crocodilians were also once warm-blooded. This video will examine the evidence for this, ranging from vestigial traits present in the crocodilians of today to traits indictive of a high metabolism in their prehistoric ancestors. Part 2 will then explore how their metabolism changed over time and why crocodilians returned to a cold-blooded metabolism. • • Sources • https://www.sciencedirect.com/science... • https://digital.library.adelaide.edu.... • https://academic.oup.com/bioscience/a... • https://academic.oup.com/biolinnean/a... • https://royalsocietypublishing.org/do... • https://academic.oup.com/sysbio/artic... • https://onlinelibrary.wiley.com/doi/1... • • 00:00 - Introduction • 01:34 - Ectothermy and Endothermy • 03:36 - Crocodilian Hearts • 05:10 - Crocodilian Limbs • 06:23 - Crocodilian Respiratory System • 07:12 - Prehistoric Ancestors • 08:27 - Pseudosuchian Limbs • 09:35 - Pseudosuchian Blood Pressure • 10:50 - Pseudosuchian Growth Rate • 11:55 - Pseudosuchian Resting Metabolic Rate • 12:25 - Conclusion

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