Honeywisp

Honeywisps are very mysterious creatures. Very little is known about them. When they die, they vanish suddenly. They tend to glow and make high pitched cries. They float across the air carrying some egg, possibly its young (although in the first game, they carried raw drops of nectar). You will find them if you pass through the spot or foliage where they reside. Simply throw your Pikmin at them to make them drop the egg and it will burst. The contents may contain nectar, spray, or Mitites. Mitites are found in their eggs because of their parasitic characteristics. These enemies cannot be petrified.

Olimar's Notes
The floating life-form drifts effortlessly on the winds. Upon death, its physical structure instantly collapses, and as this creature is particularly elusive and difficult to catch, no sample specimens have been acquired as of yet. If we could simply recover a live sample, research on this species would likely proceed more smoothly...

Louie's Notes
Although the eggs are small, the yolk has a distinctly bold and tangy flavor. Try tossing a few in a pan along with your choice of meat and fresh vegetables and cook up a country scramble!

Pikmin:Redemption
They can drop all of the new and old sprays. I can't think of anything else.

Pikmin:The After Years
Same as Pikmin:Redemption.