The Squinklorians didn't appear on the surface to be Federation material, but they persevered in their application and were eventually admitted, and have contributed enthuastically to all aspects of Federation culture.
Few make it through the academy without experiencing a Squinklorian LL-259 Training Craft, though as the Squinklorian are considerably smaller than most Federation species, fewer still find it an enjoyable part of their training, and curse Spacey11 for introducing it.