The mammals of the Jurassic and Triassic Eras were quite a bit smaller and barely resembled mammals as we know them today. Again, what human-like or other moderately-sized, land-dwelling, warm-blooded creatures would have thrived under the conditions of those eras prior to the Cenozoic? There are definitely ideal conditions under which creatures with certain adaptations thrive. There's a reason dinosaurs, these huge, cold-blooded creatures, thrived in the Mesozoic Era. And we humans have adapted to the present biosphere. I'm not sure how useful retroprojections are. It won't always be thus. There will come a time when the conditions of this planet prove inhospitable. But there's no sense in tempting fate.Originally Posted by InvisibleJim
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