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Prehistoric teeth prove that hyenas once roamed the Arctic and the relationship between ancient crocodiles and climate is more complicated than we thought.

Hosted by: Hank Green

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Sources:
Arctic Hyenas
http://dx.doi.org/10.5334/oq.64
https://www.eurekalert.org/emb_releas…
https://www.sciencedirect.com/science…
https://trove.nla.gov.au/version/2483…
https://www.nps.gov/articles/beringia…
https://cdn.elifesciences.org/article…
Croc Climate Clocks
http://dx.doi.org/10.1080/02724634.20…
https://www.eurekalert.org/emb_releas…
https://www.sciencedirect.com/science…
https://www.nature.com/articles/ncomm…
http://www.palaeogeography.net/upload…
https://www.researchgate.net/publicat…
https://www.sciencedirect.com/science…
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Images:
https://www.istockphoto.com/photo/spo…
https://www.istockphoto.com/photo/bro…
https://www.istockphoto.com/photo/str…
https://www.istockphoto.com/photo/aar…
https://www.istockphoto.com/photo/spo…
https://www.istockphoto.com/photo/nor…
https://en.wikipedia.org/wiki/File:Be…
https://www.eurekalert.org/multimedia…
https://www.eurekalert.org/multimedia…
https://www.istockphoto.com/photo/arg…
https://www.eurekalert.org/multimedia…
https://www.istockphoto.com/photo/sho…
https://www.istockphoto.com/photo/sma…
https://www.istockphoto.com/photo/adu…
https://commons.wikimedia.org/wiki/Fi…
https://commons.wikimedia.org/wiki/Fi…
https://www.videoblocks.com/video/cro…
https://www.videoblocks.com/video/all…
https://www.videoblocks.com/video/a-c…
https://www.videoblocks.com/video/gro…
https://www.istockphoto.com/photo/a-b…
https://www.istockphoto.com/photo/spo…
https://www.istockphoto.com/photo/spo…
https://www.istockphoto.com/photo/spo…