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We don't have megafauna today because our ancestors ate them. Mammoths, Giant Australian birds, giant groundsloths, all disappeared when we showed up.
by lawlessone 6y ago
We don't have megafauna today because our ancestors ate them. Mammoths, Giant Australian birds, giant groundsloths, all disappeared when we showed up.
- koheripbal 6y agoYes - but there were larger animals (including huge insects) millions of years prior to that - and many scientists suspect it's due to higher amounts of O2.
- phonypc 6y agoIIRC, oxygen concentration is theorized to be a factor in the large size of carboniferous insects only. Not relevant to e.g. large reptiles in later periods.