User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-15400750-20130916190144/@comment-4212769-20130916195406

Can't say if it's for Flying Wyverns but the spikes probably evolved for defense against something that can come from behind or above. So Flying Wyverns or Birdwyverns wouldn't be too wrong.

For the 3.: Either there will be shown a male of Nerusukyura or the actual biology doesn't apply to it. Or the males are just not seen much and go unseen out of the eyes of potential witnesses.