Tnuctip
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The Tnuctipun (singular tnuctip) are a fictional extinct alien species in Larry Niven's Known Space series.
Tnuctipun were small, arboreal pack predators, averaging about 3-4 feet long. Their heads were long and lean, and their eyes opened laterally. They are highly intelligent (average IQ estimated around 130-140) and social. As befits their carnivorous nature, they were also very ruthless, aggressive and cunning. Their word for "alien" most closely translates to "food that talks". Two billion years before humans evolved, the galaxy was ruled by the Thrintun, who telepathically enslaved other species, including the Tnuctipun.
The Tnuctipun invented most of the technologies from that era, including Stage Trees (whose structure incorporates a rocket engine), Sunflowers (flowers with integral parabolic mirrors that can focus sunlight to deadly effect), and stasis fields (a time dilation device). They were also known to have direct conversion of mass to energy and a telepathy shield (these two technologies were lost by the time of most Niven stories). In order to think creatively, the Thrintun allowed the Tnuctipun some freedom. The Tnuctipun used that freedom to stage a rebellion against their masters, the culmination of a carefully thought out, centuries-long plan.
The true nature of some of their inventions became clear: Bandersnatchi, thought to be non-sentient livestock, were in fact intelligent, created as spies immune to telepathy. Sunflowers turned against their masters and burned Thrint homes to the ground. Other Tnuctip inventions were designed to shape Thrint society to weaken it. Sunflowers encouraged a trend for the slavers to live in isolated manors, surrounded by slaves. Mutated racing vipreen (fast-running creatures raced for entertainment and gambling) ruined the existing vipreen herding business, which along with other similar inventions lead to an economic depression prior to the Tnuctip revolt.
The war escalated until the Thrintun, rather than accept defeat, employed a device that amplified the sphere of influence of a Thrint's mind control to encompass the entire galaxy. And they gave a simple command: die. And everything in the galaxy that had evolved a backbone perished, including any Thrintun not protected by a stasis field. This course of events is alluded to in the novel World of Ptavvs and a still functioning suicide amplifier itself is discovered in the short story "Peter Robinson" by Hal Colebach, at which point it is destroyed.
Several other tnuctip inventions are inadvertently discovered in the various known space novels, including a prototype hyperspace shunt, discovered during the first Man-Kzin War (in the novelette Inconstant Star by Poul Anderson). The Kzin lose the war before they can bring news of it home, and the device itself is lost.
