Mysterious green sea creature captured on video in Taiwan

PENGHU, Taiwan, June 5 (UPI) -- A man fishing in Taiwan captured video of a mysterious worm-like green sea creature crawling onto land and shared it online.

Wei Cheng Jian posted video of the creature he encountered in a Penghu port on Facebook, where commenters theorized it could be a ribbon worm, or Nemertea.

Ribbon worms have a proboscis that extends from their body while hunting, which could explain the green creature's long tongue-like appendage.

The proboscis covers the ribbon worm's prey in a thick, poisonous mucus.

The creatures usually live in the sea, but have been known to seek shelter in cool, damp areas on land.

Ribbon worms average about 7.9 inches long, but one of the creatures was known to have reached a length of 177 feet.