Well, this is an old design for a new look of the infamous basilisk. In truth, I don't like it being a cross between a snake and a rooster. I would name that a cockatrice. However, to justify the bird-like features, I told myself: what hapens when you cross a reptile and a bird? A dinosaur! So I went for the infamous Dilophosaurus, whose poisoned fame is quite extended. Also, the basilisk is called the king of serpents, and it is said to have a diadema-shaped crest rensembling a rooster's one, so I think dilo quite fit in the role.
This first version has just a dilo with some snakey features, but I'd like the ultimate version to be more snake-like, and woth maybe some frills from the basilisk lizard to justify the feathers it was said to have.
Side note: This Basilisk's stare KILLS, doesn't petrify.