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Most scientists believe that the extinction of non-avian dinosaurs occurred due to a catastrophic asteriod impact called the Cretaceous-Tertiary extinction event.
Based on fossil evidence, modern day birds evolved from dinosaurs that were not killed as a result of the Cretaceous-Tertiary extinction event.

What Killed The Dinosaurs? - University of California Museum of ...

www.ucmp.berkeley.edu/diapsids/extinctheory.html

Two main camps exist in paleontology today, each having a different view of what killed the dinosaurs and other organisms at the K-T boundary. Controversy ...

What Killed The Dinosaurs? Bad Luck, Study Suggests | TIME

time.com/3048738/dinosaurs-asteroid-killed-extinction/

Jul 29, 2014 ... While it's widely accepted that dinosaurs were made extinct by a ... the last piece of bad fortune in a run of poor luck that killed the species.

What really killed the dinosaurs? | MIT News

news.mit.edu/2014/volcanic-eruption-dinosaur-extinction-1211

Dec 11, 2014 ... Prior to 1980, the exact cause of dinosaurs' demise was unknown; one hypothesis proposed that they were killed off by massive volcanic ...

What Killed Dinosaurs: New Ideas About the Wipeout

news.nationalgeographic.com/news/2013/13/130212--chicxulub-asteroid-dinosaurs-volcano-mass-extinction-environment-science

Feb 11, 2013 ... New insights about the asteroid thought to have killed off the dinosaurs suggest it may have just been the final blow, and that the reptiles were ...

Evolution: Extinction: What Killed the Dinosaurs? - PBS

www.pbs.org/wgbh/evolution/extinction/dinosaurs/asteroid.html

In just a few years, according to this hypothesis, these frigid and sweltering climatic extremes caused the extinction of not just the dinosaurs, but of up to 70 ...

Evolution: Extinction: What Killed the Dinosaurs? - PBS

www.pbs.org/wgbh/evolution/extinction/dinosaurs/low_bandwidth.html

In the search for answers to what killed the dinosaurs, scientists have looked beyond fossils. Geological evidence also holds clues and has contributed to many ...

Evolution: Extinction: Dinosaurs - PBS

www.pbs.org/wgbh/evolution/extinction/dinosaurs/

According to scientists who maintain that dinosaur extinction came quickly, the impact must ... to what killed the dinosaurs, scientists have looked beyond fossils.

Ask HISTORY: What Killed the Dinosaurs? Video ... - History Channel

www.history.com/topics/dinosaurs-an-introduction/videos/ask-history-what-killed-the-dinosaurs

Get the full story behind the extinction of the mammoth species that once roamed the earth.

www.ask.com/youtube?q=What Killed the Dinosaurs?&v=1iNcRJGzzxs
Aug 16, 2014 ... What wiped out the dinosaurs? Most of us were taught it was a killer asteroid -- which is true. But it turns out there was more than one disaster ...
Popular Q&A
Q: What killed the dinosaurs?
A: At this point, the most commonly given answer is an asteroid strike 65 mya.  The reasons behind this are the ~65 mya Chicxulub crater in the Yucatan and the wor... Read More »
Source: www.quora.com
Q: What killed the dinosaurs?
A: Probably the most popular theory right now is the Asteroid Theory. According to this theory a large asteroid or comet collided with Earth about 65 million years... Read More »
Source: answers.yahoo.com
Q: What killed the dinosaurs and how?
A: Most scientists say that an asteroid killed off the dinosaurs. Read More »
Source: www.chacha.com
Q: What killed the dinosaurs?
A: Theories as to what wiped dinosaurs from the face of the planet range from super volcanoes through to asteroid impact and prehistoric climate change. Read More »
Source: www.kgbanswers.com
Q: What killed the dinosaurs?
A: A current theory that is widely accepted and supported by a great deal of evidence is that organisms were decimated by the environmental effects of the Chicxulu... Read More »
Source: wiki.answers.com