In the classic tradition of Mega-Beasts, this is a rock/papers/scissor relationship, with one potential spoiler:
Carpybara beats AI-Aye - electronics don't handle hose downs all that well
Racoontaur beats Carpybara - it's simple, and easily overwhelmed by a well told tale
Squarrel beats Racoontaur - it's too messed up to care about inflection and nuance
Nuclear Mole Rat beats Squarrel - (Squarrel) is too messed up to notice its legs are melting
AI-Aye beats Nuclear Mole Rat - AI-Aye is smart enough to assess the threat of direct assault, calculates ideal position, *shing*, be-headed
So who breaks the cycle? Who is spoiler!?
Nuclear Mole Rat! His radioactivity presents a threat to every other competitor but his direct counter, AI-Aye. Assuming any other critter piles on the bright blue shiny lemur, the metallic one that doesn't smell right at all, and must be rooted out, this battle is set!