In a Codex entry (can't remember which,) everyone apparently found a new avian type species just discovering space travel, so they stop on by and the species get acquainted, and exchange gifts and what not.
But then the reapers came and kicked everyone off their planet and crossed their fingers that they would be left untouched. It was a cool idea, but why not expand on it, instead of giving us another dead end in this series?
Sounds like you're thinking of the Raloi. They were introduced by the Cerberus Network News in ME2, then apparently isolated themselves back on their homeworld when the Reapers hit
Yes, that was what I was thinking of, thanks mate ^