The problem I see with this, while making it appealing could be one, is that if you're designing the full species yourself, there's either going to be a lot of information to read, or freedom for the players to get confused. Or both.... 

Personally, I'd probably find more information more interesting, but not everyone likes to have to read lots before they can play. And info isn't always easy to keep straight.

So you'd probably have to find the right balance between cementing points that should stay the same throughout, and letting players have some input of their own. If you're allowing them to answer such questions about the culture of an egglaying species, then you're certainly not stifling creativity. But if you're answering all those questions by yourself, then you might be...