Recent comments in /f/todayilearned

admiralturtleship t1_j9h2itn wrote

I just want to add that “megafauna” are not some long forgotten group of beasts that lived one JILLION years ago.

Megafauna still exist. In addition to blue whales, there are also less obvious examples like the moose.

Megafauna were common as recently as ~15,000 years ago, but saw a sudden decline due to a warming climate and human predation.

Your ancestors coexisted with megafauna and did not consider them separate from other animals (as far as we know). Many (not all) of the extinct megafauna are literally just bigger versions of things we have now. On the flip side, many of the animals we have now are the smaller version of the animals they coexisted with.

For example: beavers. Prior to the arrival of humans in the Americas, there was a giant species of beaver that was able to construct much larger dams than the beavers that we have left. The beavers we have now are like “miniature” versions of those beavers.

The small beavers almost went extinct, too. No different than their larger cousins.

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Bloomberg12 t1_j9h1fs8 wrote

There's also other limiting factors in size too, to be fair. Cancer being one of them, with a lot more cells to undergo regeneration the chance that one "goes rogue" becomes much more likely, especially since life spans typically become longer when a longer growth period is needed.

That being said some animals have developed counter measures like elephants that makes them much lower risk.

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captaineegee t1_j9h0vlp wrote

My grandfather worked first hand with Kelly Johnson during the development of the Blackbird. He was brought on because he had experience with another supersonic aircraft, the B58. He was an Air Force navigator and had experience in the B36, B47, B58, and SR71. Coolest, and most humble aviator I've ever met.

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passporttohell t1_j9gyf9c wrote

They are also the unhealthiest of big cat species, it should really be illegal to create them. Simply something that should not exist and clearly lead very difficult and uncomfortable lives because of their being bred this way.

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