It so happens i'm working on a student video game project that features creatures just like this (except that ours are surgically attatched, not raised)...here's some early concept art i made for it. I'll post some from the existing suggestions when i get a chance, this looks like fun!
Trebusheep (elephant that launches exploding sheep)
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i thought i'd join in with this pic i did on my first go at using opencanvas with a few finishing touches in photoshop:
The Scoundrel & The Bastard
My Comics Thread
Trebusheep (elephant that launches exploding sheep)
tiger-roo (tiger and kangaroo)
wolf-spider
two monkeys (okay, i admit this one is a stretch)
t-rex/elephant
and my personal favorite, the shark-scorpion:
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