A very recent example that scientists are constantly changing their theories about dinosaurs:
Quote:
Dinosaurs May Have Eaten Grass
By LAURAN NEERGAARD, Associated Press Writer
Thu Nov 17, 5:24 PM ET
... A new discovery debunks the theory that grasses didn't emerge until long after the dinosaurs died off...
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Quote:
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... grasses must have originated considerably earlier, well over 80 million years ago, for such a wide variety to have evolved and spread to the Indian subcontinent in time to be munched by sauropods, they concluded.
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Or, dinosaurs were actually created
later than scientists thought, and the grass varieties were already there for them to eat.
Quote:
"These remarkable results will force reconsideration of many long-standing assumptions" about dinosaur ecology, wrote Dolores Piperno and Hans-Dieter Sues of the Smithsonian Institution's National Museum of Natural History in an accompanying review.
Beyond the great curiosity about dinosaur life, the discovery has implications about the coevolution of this huge plant family — there are about 10,000 separate grass species — with other plant-eaters, Piperno explained.
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You can read the whole story at:
http://news.yahoo.com/s/ap/20051117/...E0BHNlYwN0bWE-