The most popular scientific understanding is that a (x) mile wide meteorite hit the earth near the Yucatan Peninsula in the Gulf of Mexico, but even this is still a contested theory and is far from fact.
inb4 birds are descendants of dinosaurs so they're not technically extinct
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Ice age.
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God destroyed the dinosaurs that;s what I believe. He saw that they were wicked and killed them. Only to bring them back in the form of plastic and breaded chicken breast nuggets.
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I thought you were leaving but wutevs I'm glad ur back.
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God drowned them for being evil sodomites.
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The KT boundary is some pretty solid evidence Also, an ice age would be an after effect of a meteor
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Sid the Sloth
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Meteor or Ice Age.
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Smoking kills.
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Chuck Norris
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#Destiny
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Steven Spielberg
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Reapers, after the dinosaurs discovered the Mass relays.
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inb4puss-out.
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Obviously it was the early transformers making transformium
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Decrease in oxygen in the atmosphere.
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God threw a meteorite at Earth, striking an underwater volcano that erupted, displacing huge amounts of water and flooding the world, only to cause an ice age from the world's increases albedo.
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Death
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All this thread makes me think of is transformers 4 age of extinction
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Edited by MudStik: 7/22/2014 3:28:46 AMExcessive heat/radiation from a asteroid.
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Edited by Banned n3rd: 7/22/2014 3:09:55 AMA gigantic brain
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They all killed themselves because they heard humans were coming. The impending stupid was too much to handle.
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Aliens
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They all had two beers and died.
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They committed Sudoku.
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Changes in the atmosphere