Halzyn

Halzyn is a creature that flies with vigorous wing flaps. The hard shell on both sides of its body keeps it safe from beam attacks. The X copy boasts stronger, spiked shells and drops downward when a target moves under it. However, this leaves it vulnerable, as the weight of its shell makes it difficult to fly back upward. The shell on this version can be destroyed, leaving its body exposed.

Manual
"If [sic] flies unsteadyly [sic] in the air. The hard shell on both sides of its body keeps it safe from beams fired its way."