List of extraterrestrial life in Alien Planet

This is a list of all aliens from the Discovery Channel show Alien Planet

Arrowtongue
The Arrowtngue is about the size of a T-rex, and like the dinosaur, is a predator. It is blind, so instead uses a sonar system to see. It has bioluminescent patches on its back it uses to scare off intruders. It has tentacle-like arms and a pair of large, muscular legs. The Arrowtongue is called this due to a retractable appendage on its mouth that can attack prey. This appendage is also a feeding tube used to suck out the insides of its prey.

The Arrowtongue was the first fully-formed alien to be sighted by Leo and Ike, and performed a threat posture at the probes. It attempted to attack Leo with its tongue, and then turned its attention to a Gyrosprinter and chased it, but did not manage to attack it.