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Oxford Professor Claims Aliens Already Breeding With Humans

Getting off topic, but have you heard the theory that there were probably fewer dinosaur species than currently thought? i.e. different fossils currently classified as separate species may instead represent sexual dimorphism and age changes, as you mention.

It's a very real possibility, I'm very suspicious that one species described only from a foot bone, another from a rib and a third from a bit of jaw, aren't all the same creature and that's not even taking into account variations like sex, age and general variance. However, the overall numbers may still be roughly "the same" in that the reduction caused by the errors above might be balanced by all the undiscovered species and those that have not left remains due to chance.
 
Do we have a reason that he said the original statement? I'm wondering if it's a thought exerice in a tutorial which has grown wings!
 
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