Puudly

The Puudly is a sapient, telepathic species of extremely dangerous aliens, notable for their extreme instinct of self-preservation, which manifests in such a way as to consider every other lifeform a threat that must be eliminated.

Biology
Little is known about the Puudlies, except that they are strong, quick, and biologically equipped for killing. They have advanced telepathy and reproduce by budding; spawning dozens of offspring each time. They reach maturity in no more than a few hours.

The Puudly's preferred method of killing involves telepathic suggestion. A Puudly can induce any kind of thought into its victims' brains, and may use this ability to lure the victim towards doom, entrance them while it kills them, or drive them to suicidal madness or inaction. Besides, the Puudly is also capable of passively probing minds from distance to keep track of their victims' moves.

Culture and society
The mind of a Puudly operates in a vastly different way from most other races, which tend to only take action against that which is perceived as a threat. A Puudly, on the other hand, will take action against any species, no matter how seemingly harmless. The Puudly displays neither empathy nor malice, and believe they're merely acting on the defensive, trying to wipe out other races before said races wipe them out instead. The resulting genocidal instinct and paranoia makes this one of the most dangerous species in the known cosmos.

Despite their intelligence, Puudlies are regarded as no more than animals by Humans. There are strict laws against harboring one on Earth, and if one happens to be brought illegally to the planet, it will be hunted down by authorities and promptly killed before it can reproduce.

Appearances

 * "Good Night, Mr. James", by Clifford D. Simak (1951)