Quote:
Originally Posted by slappyjenkins
It's not a dog growing wings so that someday it becomes a giant flying bat-dog(you can say gradually over a billion years all you want, it's still not happening!). Or is that what you're saying?
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The theory isn't that a species will suddenly sprout wings that initially give it no advantage.
A species already has forelimbs limbs and walks upright.
A population develops feathers, these either keep it warm/sexually attractive.
Luckily, this combination of feathers, forelimbs and walking upright means it can then glide short distances.
The further it can glide, the more successful it is. Individuals with longer forelimbs/lighter bones can glide further.