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Why were sauropod dinosaurs so much bigger than any other animal on land before or after?
There are 3 groups of dinosaurs: theropods, ornithischians and sauropods.
The biggest theropoda ever weighed maybe 10 tons [smaller than many land mammals].
Ornithischians were the same size as mammals [biggest ever being close to 20 tons just like the biggest land mammals ever].
But Sauropods destroyed every record before and after.
We could blame the environment, but the other animals back then were comparable to mammals in size.
To me it seems the common denominator has something to do with sauropods themselves. Why were sauropods specifically so big, even compared to other dinosaurs?
Read the rest of the statement: everything else wasn't bigger back then. Other dinosaurs were mammal sized and both arthropods and mammals were smaller than they are today. A recent study also confirmed that 02 levels from the Triassic to the Cretaceous went from 10% to 15%, not to be confused with the hiked levels during the carboniferous.
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- thomas fLv 71 month agoFavorite Answer
Larger size is nearly always an advantage, but with one proviso: There must be enough food available to sustain the size. The Earth was much warmer and rainier during the time of the dinosaurs, which produced a huge profusion of plant life. The sauropods grew huge because there was plenty to eat, and as I said, large size is otherwise nearly always an advantage.