the.com/gulper

a deep-sea eel that's basically a swimming mouth with regrets about portion size

means One who gulps — someone or something that swallows quickly and greedily — or, specifically, a deep-sea eel of the family Eurypharyngidae known for its enormous, balloon-like mouth.

from From the verb "gulp," which entered English in the 14th century, likely from Middle Dutch or Flemish "gulpen," meaning to swallow or guzzle — an imitative word, the kind that sounds like the throat-noise it names. Add the "-er" of the doer, and you have a gulper: literally a thing that gulps. The fish earned the name for obvious reasons.

jaw size
mouth bigger than the rest of its body
depth
lurks down to 3,000 meters of black water
tail trick
tail tip glows pink and red to lure prey
diet
swallows prey larger than itself whole
stomach
belly stretches like a balloon for big meals
for instance

pelican eel — deep-sea fish with enormous hinged mouth, found below 3,000 feet in oceans worldwide

gulper catfish — asian catfish species that swallows prey whole, native to southeast asian rivers

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