Tubamail-S

Tubamail-S is a bird-like enemy in Mega Man X2, and they do a kamikaze flight toward X. They emerge from the Tubamail Generator (see below).

Tubamail Generator
Tubamail Generator are large hatches that deploy the Tubamail-S. Mainly they appear in Wheel Gator's level, but they also appear in Agile's stage and as an enemy summoned by the Sigma Virus.