I would pretend that I was joking when I put that up and that I was actually pretending that it was a feat to see if anyone would be good enough to notice however to be perfectly honest I have never heard of an Extraodinary ability. They sound cool though (I bet this is basic DM knowledge and that everywhere people will be reading this and will be going into a state of shock). However reading your advice, I have used the Hatch eggs feat, extraodinary ability thingy on other monsters at home and to be honest, I can think of plenty of monsters that would benefit from it. Like a magic chicken. I don't think being able to lay eggs is that extraodinary anyway and I doubt that this FEAT is exclusive to butterflies. Hey I know....
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