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Why did the dinosaurs die out?

ILLYRIAN

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To all of those well informed people on Buffy Boards, who can tell me why the dinosaurs died.

And for those members who think they are funny, which one of the dinosaurs would get the wettest when it rained?
 

Spanky

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The cavemen ate them all. Everyone laughed when Fred got his Brontosaurus burger, but they didn't think about the lasting ramifications.
 

Ethan Reigns

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It is estimated that the oxygen content in the air was 30% in the era of the large dinosaurs., That is the only way large bodies could work - if a blood vessel is tens of metres long, there has to be a large oxygen content or there will be nothing left at the end of it. This was facilitated by a 5°C higher average temperature than now, a carbon dioxide content of 1100 ppm (to maintain existing temperatures, it would have to be 350 ppm and it is now about 415 ppm). Huge forests were the norm. Forest fires would be almost impossible to contain at a 30% oxygen level. The asteroid that killed the dinosaurs didn't kill them directly, it killed the forests which meant that small mammals, which are more efficient in the use of oxygen, came to the forefront.

The Jurassic Park reconstructions of dinosaurs wouldn't work for the large ones - they would be asphyxiated by the low oxygen content in modern air.
 

Stake fodder

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To further what others said, the climate was cooling and becoming less favorable for herds of large animals that require a lot of food. On top of that, a large meteorite (est. 10 km across) hit that likely threw dust up into the air for several years, cooling the Earth further. It is believed that the meteorite hit off the coast of Mexico, where you can still see a large curve, the edge of the crater, where the Yucatan peninsula is.
 

ILLYRIAN

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There are some well thought out notions, sort of, but did no one consider there size was a factor in why most of them died out?

My thanks to Spanky for his guess about which dinosaur got the wettest when it rained.
 

ILLYRIAN

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So why did the dinosaurs die out? I thought it was an obvious reason - they were to big to get on the ark.

As for which dinosaur got the wettest whenever it rained - the T.Rex - its front arms were to short to hold the umbrella above its head.
 

Dora

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Hugh meteorite , plenty of crap into the air blocking out the sun for years , only small mammals survived
 

Nix

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They run out of baileys!
 
ILLYRIAN
ILLYRIAN
Really! Glass wasn't invented then. Don't tell nightshade but Baileys was sold in plastic bags.

nightshade

Your grandfather is a cat
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They got eaten

460594_1
 
Nix
Nix
Abbs loves turkey dinos
ILLYRIAN
ILLYRIAN
Its a be nice to @Nix day, Dino's are Bailey's flavoured chunks of guess what? Yup you guessed it, Chicken!
Buffy Summers
Buffy Summers
Those are the best! I have some in my freezer :D

HowiMetdaSlayer

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One recent theory is that it was multiple factors (volcanic activity finished by meteor). Also that they may have been on the decline already.
Not sure about the oxygen level thing. From what I googled it seemed kind of mixed. One report seemed like oxygen levers stayed high till much later.
Which some argue is the reason for all the pleistocene megafauna, and the more recent lower oxygen levels helped in their extinction
 
ILLYRIAN
ILLYRIAN
Thanks

Stake fodder

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As for which dinosaur got the wettest whenever it rained - the T.Rex - its front arms were to short to hold the umbrella above its head.
My vote for wettest would be the apatosaurus or brontosaurus. They were much bigger and longer than the T. Rex, therefore more area to get wet! But then, there were ocean-living dinosaurs the same size or bigger, so they would be wet all the time.
 

ILLYRIAN

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Them poor dinosaurs that lived in the sea, I bet they had a right sod of a time with an umbrella them naughty nautical parachutes!
 
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