Like someone else pointed out, it's possible for the same niche to be occupied by several different creatures, so long as that niche is not too small. There could be influences like, birds handle cooler weather better than dragons, dragons are nocturnal/birds are diurnal, different predators in different areas favor birds over dragons as prey. etc.
So I think it really depends on how 'alien' you want to make the world.
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timeasmymeasure
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Date: 2014-06-21 04:47 pm (UTC)So I think it really depends on how 'alien' you want to make the world.