Tubamail-S (ツバメール・Ｓ Tsubamēru S?) is a swallow-like Mechaniloid originally created for mail delivery, but Mavericks remodeled it as a missile and it appears as an enemy in Mega Man X2 and Mega Man Xtreme. They emerge from Tubamail Generators or gaps in the ceiling in Wheel Gator's stage, and will try to kamikaze into X. As they fly at high speed, dashing under them may prove to be easier than jumping over or trying to destroy them with X-Buster shots. All Special Weapons are very effective on them, except the Crystal Hunter. They are also one of the enemies summoned by the Sigma Virus.