Simple script enabling you to add ducks on any page.

Include js and css in html:

<link type="text/css" rel="stylesheet" href="duckhunt.css" />
<script type="text/javascript" src="duckhunt.js"></script>

Create element to place the container in:

<div id="flySpace"></div>

Create an instance of the duckhunt passing the id of parent element:

var hunter = Duckhunt.create('flySpace');

// optionally edit some values
hunter.maxDucks = 10;
hunter.duckSpawnDelay = [ 200 /*min*/, 1500 /*max*/]; // in ms

Example can be found here.