MicKindle -
The first thought that comes to mind with the theme is Noah's Ark - not sure if the event is Christian-oriented. Another thought would be to do a jungle theme... some big animals (tigers, elephants, etc) and then small ones (snakes, spiders, etc.). It could be cute with the right spin. And now my stream of conciousness is going to doing a Madagascar theme - that would definately cover the gamut of different sized animals (include the Lemurs for the small sized animals), though not sure if it's age appropriate.
So, that's just some thoughts quickly thrown out there...
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