From PBS Eons.
Check out Overview on PBS Terra: https://www.youtube.com/watch?v=NYA6GF1uAa8&
Long-jawed proboscideans were doing pretty well for themselves. That is, until they were all rapidly replaced with proboscideans with long, flexible trunks instead: mammoths, mastodons, and our modern elephants.What suddenly made long jaws such a liability? Well it looks like we can thank a changing climate for the evolution of the elephant’s trunk.
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References:
https://docs.google.com/document/d/1DqT9nbzjpx4dgIXM9wnXq-Hx2raFZFAbIZ-oEg_qy4k/edit?usp=sharing