As already suspected, Vegans are a cowardly species with horn-like protrusions in their foreheads. What is only a small surprise is that they also emit anti-gravitons in order to support their own awkwardness.
Essential Official Handbook of the Marvel Universe (Vol. 1, No. 11) proves that the race hails from Vega (duh), is over 30-feet tall, and actually have opposable thumbs to better grip their tofu.
[via Boing Boing]