The Perricans were a pre-warp species native to the planet Perrican.
In 2246, Captain Robert April of the USS Enterprise chose to warn the Perricans of a potentially apocalyptic meteor shower about to strike their homeworld, in violation of the Prime Directive.
During Una Chin-Riley's court martial in 2259, Neera Ketoul cited the Perrican incident as an example of when a Starfleet captain had exercised their judgment over the application of law for the greater good. (SNW: "Ad Astra per Aspera")