Nightbarb

From Wikitroid, the Metroid wiki

Nightbarbs are small, airborne Darklings with three wings. Nightbarbs are primarily found in Dark Agon on Dark Aether, although they can be found in other sectors as well. Nightbarbs travel in packs to scare off their primary predators, the Hunter Ing. Nightbarbs can be easily destroyed by projectile weapons, but can still be a nuisance at times. They can be more of a utility than an enemy sometimes; they make easy targets for the most basic weapons and shooting a mass of them can yield many powerups. This is a great way to restock on missile ammo, and a decent way to restore energy.

In Metroid Prime 3: Corruption there are Nightbarbs on Bryyo that aren't darklings. They also travel in packs. Also on the planet are Phazon Nightbarbs, Nightbarbs that are charged by Phazon. These types of nightbarbs are more threatening; they gather in groups then charge up energy to fire at Samus. The normal ones have a relatively weak attack, although it has a lot of pushing power; it has a large potential to knock Samus off a cliff. Normal Nightbarbs can be killed by having their energy attack overloaded while they're charging it. This can be achieved by shooting into their energy gathering. Phazon Nightbarbs possess a powerful attack and can launch smaller energy attacks individually when their group becomes to small to use a collective energy attack. However, they are constantly vulnerable to Hypermode attack.

Metroid Prime 3: Corruption Nightbarbs are invulnerable to attack unless charging in a group (Phazon Nightbarbs are vulnerable even when not charging, but they're not the same creature), while Metroid Prime 2: Echoes Nightbarbs are only capable of causing damage on contact.