Honeywisp

Honeywisps are creatures found in the first two Pikmin games and Pikmin 4. They float across the air carrying nectar (in Pikmin) or an egg (in Pikmin 2 and Pikmin 4), and tend to glow and make high pitched cries, appearing and disappearing out of thin air if a leader passes nearby set places where they can show. A Honeywisp's egg, like any other, may contain nectar, a spray drop, or Mitites.

Behavior
Honeywisps appear only when approached and disappear after a short amount of time. They float a considerable distance above the ground at a slow pace, and they take no note of the presence of leaders or Pikmin, unless attacked, at which point they will feverishly drop their nectar or egg and vanish. They are frequently found grouped in a general area, though not all will be activated at the same time.

Strategy
The Honeywisp is a constantly airborne enemy. As such, it can only be killed with Pikmin. If a Pikmin is thrown at one, it will vanish and drop its nectar. Yellow Pikmin are your best option due to their high throwing arc. When trying to take down a Honeywisp or a group of Honeywisps, its usually fine to throw quickly with less precision to take them down, as there is no risk in fighting them unless other creatures are nearby.

Neither White nor Purple Pikmin are especially effective against this creature, and it cannot be petrified in any way.

Trivia

 * Although the Honeywisp cannot be killed, it still has a health value of 99999 in Pikmin 2's files.
 * A near-copy of the Pikmin 2 Honeywisp exists unused inside Pikmin 3. It functions identically to the Pikmin 2 counterpart, except throwing a Pikmin at the egg causes Pikmin 3 to instantly crash.