FaceHugger

https://www.cgtrader.com/3d-models/character/sci-fi-character/facehugger-fanart

The Facehugger, known taxonomically as Manumala noxhydria and designated "Stage 1" Xenomorph by Weyland-Yutani scientists (and "Stage 2" by other sources), is a parasitoid form of the species Xenomorph XX121 that hatches from an Ovomorph. It is the second stage in the Xenomorph's life cycle, and exists solely to implant a Chestburster within a living host creature via their mouth. As such, it has no real offensive capabilities (beyond an ability to spit acid, which is generally only used to gain access to hosts and not for attack) and must rely on stealth, surprise or their victims being previously immobilized by an attacker to achieve implantation. Notably, a Facehugger dies shortly after its task has been completed.