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Why Were Dinosaurs So Much Bigger Than Animals Today?
Time:27-05-2014  Hits:63

Not every dinosaur was gigantic, but the ones that were were absolute behemoths. So, why did they get so much bigger than animals that walk the land today?

Image: The sizes of some of Mongolias common dinosaurs in comparison to a person, including the adorably petite Velociraptor. / Conty

Matthew Carrano, the curator for the Museum of Natural Historys Dinosauria, explains his thoughts on how dinos attained their size — and why the real question might be not why dinosaurs were so big, but why are we so small?:

Its not clear how oxygen relates to size evolution, but thats one hypothesis out there. I tend to think that evolution takes advantage of opportunity until some sort of limit is reached, and dinosaurs had different limits than modern mammals. In fact, Id say the real question is why mammals (at least on land) are so small.

One thought is that dinosaurs laid eggs and so did not have any problems reproducing even at huge sizes. So population crises could be overcome simply by laying more eggs. Mammals have a terrible time because at large sizes they can only make one or two young every one or two years. If something goes wrong (diseases, etc.), it takes a long time for the population to recover. So mammals are constrained from being very big in a way that dinosaurs werent.

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