Skreek is a somewhat bird-like enemy that Samus Aran fought during her mission to SR388 in Metroid II: Return of Samus. They hide in gaps in the ground, and suddenly appear to attack Samus, spitting bullets from their mouths before retreating back to their hiding place.
"They usually hide in the gaps in the ground or in the liquid. They will suddenly appear to attack, spitting bullets from their mouth."
- It is unknown if the Skreek species became X Parasite hosts during the events of Metroid Fusion, as no Skreek-X are on the BSL.