Twitter iPhone Animation Intro in CSS

On desktop, hover over the bird to trigger.

On iPad/iPhone, click the bird to trigger. Click this button for the click action to work again.

I like the Twitter animation that you see right when launching the app. When you click the icon, it moves to the center of the screen and seamlessly transitions into the splash screen. Then the icon backs off a bit and shoots forward to fill the screen with white as the app fades in.