A global citizen science platform
to discover, share and identify wildlife

Join Project Noah!

Hammerhead worm

Bipalium adventitium


A voracious predator of earthworms, this species is distinguished by the single maroon line running down its yellow body. It crawled slowly and left a track of shiny, mucoid secretions on the plank.


I found it underneath a decomposing wood plank that housed a termite and carpenter ant colony.


Bipalium is an invasive species in the US. Although found on land, this hammerhead worm produces tetrodotoxin to paralyze its prey, the same compound in pufferfish and a few other fish.

Species ID Suggestions

Sign in to suggest organism ID


mauna Kunzah
Spotted by
mauna Kunzah

NYC, New York, USA

Lat: 40.60, Long: -74.12

Spotted on May 11, 2019
Submitted on May 19, 2019

Related Spottings

Bipalium Hammerhead worm Hammerhead Worm Hammerhead worm

Nearby Spottings

Humungous fungus Spotting Red-bellied woodpecker Eastern gray squirrel