The creatures have long, segmented serpentine bodies: located on one end is their head featuring a pair of large pincers with small teeth on their inner sides. The other end is not visible due to the Yapping Maws being firmly planted into the surface where they are found. When idle, the animal's only visible segment is its head while its pincers periodically open and close, causing a deep, audible snapping noise. In Maridia, however, there is a pair of Yapping Maws which are not only fully hidden from view due to the quicksand where they are buried, their snapping sound cannot be heard either.
If Samus were to find herself sufficiently close to the Yapping Maw, it will extend its body towards her as it attempts to bite her with its pincers. If successful, it will hold her firmly and drag her to its resting spot. On many occasions, the creature will be resting on a bed of spikes and thorns, or within pools of lava, therefore causing her to receive damage from these hazardous materials until the Maw releases her. In other locations, they will be curiously nestled inside the mouths of Samus Eaters; this suggests that a symbiotic relationship can exist between both creatures, as a Yapping Maw will grab hold of potential prey and drag it into the carnivorous plant's waiting mouth.
As previously mentioned, there are Yapping Maws hiding in a pit of quicksand and cannot be seen until they lunge upward to attack Samus. If she is not fast enough, she will be dragged below and reappear sinking within a small vertical room of sand inhabited by Bulls before eventually reaching a lower section of Maridia. This can cause her to be lost if she has yet to familiarize herself with the area.
|Color||HP||ATK||E||BE||M||SM||PB||Crateria/Brinstar/Norfair/Maridia. They will quickly reach out and grab you.|
"Hard to kill. Wait until they reach out and withdraw; you then have a few seconds of safety to leap over them."
- Yapping Maws bear some resemblance to the Acid Worm encountered in Kraid's Lair during Metroid: Zero Mission, in appearance, habitat, and behavior.
- Yapping Maws may actually be plant-life of some sort, as they are mostly seen around water and surrounded by other plant-like bioforms.
- The Yapping Maw may be inspired by the real-life Bobbit Worm, whose hunting tactics are virtually identical to its behavior.
- In the internal data, Yapping Maw is referred to as Hand.
|Tallon IV||Aqua Reaper • Aqua Sac • Chomper Fish • Fish • Jelzap • Tangle Weed • Tallon Crab|
|Aether||Blogg • Bloggling • Alpha Blogg • Fish • Brizgee • Dark Blogg • Grenchler • Hydling • Krocuss • Phlogus|
|Dark Aether||Chykka • Dark Blogg • Dark Grenchler • Dark Phlogus • Dark Shredder • Flying Ing Cache • Venom Weed • Watchdrone|
|Zebes||Botwoon • Bull • Cacatac • Choot • Draygon • Evir • Gadora • Gamet • Oum • Owtch • Powamp • Puyo • Sciser • Skultera • Tatori • Tatori, Jr. • Yapping Maw • Yard • Zoa|
|BOTTLE SHIP||Fish • Skultera|
|BSL||Aqua Zebesian • Evir • Gadora • Owtch • Powamp • Sciser • Serris • Skultera • Yard|
|Carnivores||Phazon tendril • Ridley • Vorash • Yapping Maw|
Plants: Bloodflower • Dark Phlogus • Samus Eater • Shrieker • Sporb • Tangle Vine • Tangle Weed • Venom Weed • Zazabi
|Detritivores||Grizby • Phazon Leech • Parasite (Plated/Ice/Queen) • Sbug|
|Insectivores||Bryyonian Shriekbat • Flickerbat • Gel Ray • Glowing spidervine • Ice Shriekbat|
|Omnivores||Green Kralee • Human • Ice Parasite • Little birdie • Space Pirate|