Enjoying this so far. In odd synchronicity, it made me more curious about the papers behind this article (which I need to look into) which suggests we're finding evidence there has never been a mass extinction: https://www.newscientist.com/article/2481371-theres-growing-evidence-the-big-fiv...
This book, of course, is pretty certain that there was!
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I did like learning about ancient crocodilians in a footnote -- they were bipedal and stood upright! Article with an example image: https://www.theguardian.com/science/2015/mar/20/revealed-the-terrifying-3m-long-... 2d