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post #21 of 24 (permalink) Old 10-27-2007, 11:32 AM
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Just like XitUp said, evolution doesn't always make animals bigger, it just make them more suitable for the current environmental conditions. That's why some prehistoric eras (like the Jurassic and the Pleistocene) has so many large animals, while some eras, e.g. the present, have very few.
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post #22 of 24 (permalink) Old 10-27-2007, 11:34 AM
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Quote:
Originally Posted by Couchwarrior
Just like XitUp said, evolution doesn't always make animals bigger, it just make them more suitable for the current environmental conditions. That's why some prehistoric eras (like the Jurassic and the Pleistocene) has so many large animals, while some eras, e.g. the present, have very few.
Exactly and like i said Crocodiles have shrunk in size as well.


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post #23 of 24 (permalink) Old 10-27-2007, 11:45 AM
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Are you guys even sure modern crocodiles are descendants of the ancient giant ones? When the dinosaurs died off it could of killed off the giant ones giving smaller species of crocodiles a chance to thrive. I can't find any information on this for some reason so this is just a guess.
An interesting bit of information I did find
Crocodile embryos do not have sex chromosomes, and unlike humans sex is not determined genetically. Sex is determined by temperature, with males produced at around 31.6 degrees celsius, and females produced at slightly lower and higher temperatures. The average incubation period is around 80 days, and also is dependent upon temperature.


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post #24 of 24 (permalink) Old 10-27-2007, 01:40 PM Thread Starter
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Quote:
Originally Posted by Couchwarrior
Just like XitUp said, evolution doesn't always make animals bigger, it just make them more suitable for the current environmental conditions. That's why some prehistoric eras (like the Jurassic and the Pleistocene) has so many large animals, while some eras, e.g. the present, have very few.
evolution is about making animals more well suited to their enviornment. the economy of size is what lead to most animals to be smaller than their ancestors. mammals grew bigger, but humans aren't as big as gorillas. and cold-bloodedness isn't suited too well to being gigantic, so now lizards are small. although, if they didn't have the mass extinction, who knows...

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