Groaci

The Groaci, a.k.a. Groacians, are a sapient species from the planet Groac which have a turbulent relationship with Humans.

Biology
Groaci are pale, spindle-legged creatures with throat-bladders that vibrate when they speak, olphactory sphincters, and five retractable eyestalks that move independently. They also have a keen sense of hearing and can spend long periods of time without water. Their younglings are called grubs.

Like Humans, Groaci are vulnerable to experiencing seasickness. Alcoholic beverages are generally poisonous to them, but there are some that they can consume and get inebriated. Their diet includes fruit, such as the hoob melon. They also consume caviar and wafers.

Appearances

 * "The Madman from Earth", by Keith Laumer (1962)
 * "Aide Memoire", by Keith Laumer (1962)
 * "Cultural Exchange", by Keith Laumer (1962)
 * "Mightiest Qorn", by Keith Laumer (1963)
 * "The City that Grew in the Sea", by Keith Laumer (1964)
 * "The Prince and the Pirate", by Keith Laumer (1964)
 * "The Castle of Light", by Keith Laumer (1964)
 * "Giant Killer", by Keith Laumer (1965)
 * Retief's War, by Keith Laumer (1965)
 * "Dam Nuisance", by Keith Laumer (1966)
 * "Forest in the Sky", by Keith Laumer (1967)
 * "Retief, War Criminal", by Keith Laumer (1967)
 * Retief and the Warlords, by Keith Laumer (1968)
 * "Retief, the Long-Awaited Master", by Keith Laumer (1969)
 * "The Piecemakers", by Keith Laumer (1970)
 * "Ballots and Bandits", by Keith Laumer (1970)
 * "Pime Doesn't Cray", by Keith Laumer (1971)
 * "Retief, Insider", by Keith Laumer (1971)
 * "The Garbage Invasion", by Keith Laumer (1972)
 * "The Negotiators", by Keith Laumer (1975)
 * "The Hoob Melon Crisis", by Keith Laumer (1975)
 * "The Troubleshooter", by Keith Laumer (1975)