<p>Aliens do not exist as far as we know. We do not have the technology to explore other planets. Besides, evo-devo only concerns life here on Earth.</p>
<p>Ohh, that's right. <em>smacks self on the head</em> I remember seeing the diagram where Aves branched out of some reptile infraclass.</p>
<p>Somewhere along the way, a gene was mutated and a reptile (in the process of change) hatched a species that mated with others like it and eventually gave birth to what can be classified a chicken. For the record, I'm not on either side of the gradualism vs. punctuated equilibrium debate.</p>
<p>.</p>