The Legacy of Heorot  The Legacy of Heorot is a science fiction novel by American writers Larry Niven, Jerry Pournelle, and Steven Barnes, first published in 1987. Reproduction and fertility expert Dr Jack Cohen acted as a consultant on the book, designing the novel life cycle of the alien antagonists, the grendels. This is the first book in the Heorot series. It concerns the establishment of the first human colony on Avalon, fourth planet of Tau Ceti. Two hundred colonists arrive on Avalon, having made the 100-year journey from Earth in suspended animation on the starship "Geographic". The colonists, selected for their outstanding physical and mental acuity, make a terrible discovery: the suspended animation has damaged their intellect and reasoning skills. Some are only mildly afflicted, while others have serious intellectual disabilities; eight cannot be reanimated at all. The colonists build a settlement on an isolated island, and begin growing crops and stocking the nearby waters with terrestrial species to complement the "samlon", a local aquatic species. The colonists become overconfident in their security, to the frustration of expedition security officer (and former soldier) Cadmann Weyland. When unsettling events begin to happen – missing animals, fences torn down – the colonists' impaired minds prevent them from properly analyzing the situation. Weyland is suspected of sabotage to further his agenda of building up defenses. He is drugged and restrained when a monster attacks the settlement, killing ten colonists. Resenting his treatment, Weyland retreats from the colony to an isolated homestead on a mountain near the colony. Mary Ann, a colonist with a romantic interest in Weyland, convinces him to allow her to stay with him, and conceives his child. Ultimately, Weyland agrees to assist the colony in its defenses. The colonists are confounded by the ecology of the island, as there does not seem to be a sufficient food source for the creatures to inhabit it. An autopsy reveals that grendels (as the creatures are now known, in reference to "Beowulf") are crocodilian in appearance and behavior, with powerful jaws and claws, and a sense of smell better than a dog's. Its brain shows it is at least as intelligent as a gorilla. It possesses a snorkel enabling it to lurk under several feet of water. Its cardiovascular system and musculature give it strength and stamina far beyond that of humans. A grendel can release a super-oxygenated blood supplement into its blood that does to it what nitrous oxide does to internal combustion engines – enable short bursts of speed in excess of 100 miles per hour.