What is Zupertails?
1.
The small orange-white two-tailed fox that helps the blu hedgehog Sonic (in the similar named video game).
Whenever he gains the power of the 14 chaos emeralds, he can transform into Super-Tails (or as the magazine Computer And Video Games described it in a 1993 special : "Zupertails")
Small birds appear flying around Tails in this form.
...and with the power of the 14 Chaos emeralds, Tails surpasses Sonic and becomes Zupertails... (CVG,1993)
See