SO Shiva..

[Viridiana]

So either there is more to the scale-y beasts then meets the eye or cross-breeding is possible between everything and anything that is a living creature (which then brings up serious some questions about who were miqo'te ancestors).

You guys tryin' t' tell me dragons be mammals?

Nobody said that there was the possibility of offspring. Just because she got freaky with a dragon (according to myth, anyway) doesn't mean it was a fertile pairing.