Mega Nest

Mega Nests are an immobile enemy in Mega Man X4 that appear in Web Spider's stage. They spawn Kyunbyunn, and in the very few times you encounter one, they hang from the ceiling like bee hives. They make an appearance in the Mega Man Zero/ZX Legacy Collection trailer.

Kyunbyunn
Kyunbyuun (キュンビューン) is a wasp-like enemy that appears in Web Spider's stage. It also appears without the Mega Nest in Mega Man Xtreme 2 with many of the same attacks. They come out of the Mega Nest and attack by flying towards X or Zero. 

Similar enemies

 * Kyuun B
 * Bomb Been