Hanonian land eel

From Memory Alpha, the free Star Trek reference

The Hanonian land eel was a giant serpentine lifeform native to Hanon IV. Predatory in nature, it inhabited mountainous caverns and ambushed prey that approached its lair, leaving their bones piled at the cave entrances.

When the crew of the USS Voyager was stranded on Hanon IV in 2373, a Hanonian land eel killed Ensign Hogan when he attempted to collect some bones near the cave. Later, a number of Voyager crew escaped from a group of pursuing native humanoids by entering the cave of a land eel, and although they did lose another crew member to the eel, the rest narrowly avoided being eaten in the process. (VOY: "Basics, Part II")

The Voth scientist, Forra Gegen searched the lair of the Hanonian land eel almost a year later, looking to get genetic evidence to support his Distant Origin Theory from Hogan's remains. (VOY: "Distant Origin")