Explorer

This is a species of aliens of which two explorer individuals are known. Those are "required to contact, welcome, and log in any and all sentient races or multibeings in the quadrant, without prejudice, fear, or favor". However, when they find humans, they deem them too bizarre for being  "made out entirely of meat" and decide to erase the records instead of doing their mission.

Description
This species is settled across multiple planets, is capable of faster-than-light travel (because they are not limited to c space) and has a lifespan much longer than that of humans. Details about their physical composition is unknown, but their bodies most likely have no "meat" (muscles) at any stage of their lifespans.

Events
At one point, they took human specimens aboard their recon vessels and probed them "all the way through", studying them "for several of their lifespans". They discovered that humans, unlike any other known species, are composed entirely of "meat" and never leave this state. Those two explorers judge the meat-based Earthlings as a strange species and, after one of them concludes humans have only very remote chances of contacting them, decide to erase the records of their existence.

After agreeing to ignore and forget humans, they turn to an uncontacted hydrogen core cluster intelligence living nearby, which they find much more interesting and acceptable.

Appearances

 * They're Made Out of Meat (1991), short story by American writer Terry Bisson