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fossilworks.org and paleobiodb.org are reasonably good databases for fossil records. Paleobiodb has even got a map based view which is really convenient. Thank you.


Answer is quite simple as from @Alan Boyd link. They are cold blooded and thus, can go out for hunt in cold, they need to stay put till they get some prey. So, it mainly depend on the temperature of the outside, I found this interesting paper on relation of body sizes and latitude. Body sizes of poikilotherm vertebrates at different latitudes ...

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