The egg you chose hatched into a deadly Marked Gold. Better feed it before it decides that you taste good.
Golds are generally the largest of the normal colors - topped only by the Charcoal - and are almost always female, though male Golds aren't uncommon. As the largest, the Golds rule over any other color except Charcoal and have a tendency to harass and, in some cases, kill lesser colors. Golds are more of a solitary color, and will only tolerate flits that have proven themselves by surviving the Gold's attack and not fleeing. Marked Golds are as large as a normal Charcoal, and lord that fact over normal Charcoals at every opportunity they have. Marked Golds have little to no use for any normal color at all, even normal Charcoals.