Capellan Power-cat

The Capellan Power-cat is a non-sapient species capable of generating strong electrical discharges.

Biology
A Capellan Power-cat is a feline-like quadruped, about the size of a panther, with clawed tridactyl paws and a short tail. It has yellow eyes, brown fur, and a row of spikes on its back. It's infamously known for being impossible to keep in captivity and for its ability to emit electrical discharges of 2,000 volts.

Appearances

 * Star Trek, animated series, s02e05, "How Sharper Than a Serpent's Tooth" (1974)