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I listened to this on audiobook and it was great.

The premise was a human ends up travelling to an alien planet. The aliens have a perimeter to their 'base' that is under constant attack from the planet's animals. It is revealed towards the end that there is some sort of signal being transmitted that is making all the animals and plant life attack a certain point on the planet (where the aliens are).

Other major plot points I remember: The human traveller falls in love with an alien. The aliens have a sort of virtual training environment that simulates life outside the perimeter, where plants attack you etc. There is a secondary alien group that the human ends up with, and although they are rivals to other group, they have a trade set up.

Any help much appreciated! Thanks.

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    I found it. Deathworld by Harry Harrison. – Matthew Sharp May 30 '17 at 2:11
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Deathworld by Harry Harrison.

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It's a part of a trilogy. Plot summary from Wikipedia.

  • This answers your point on a human travelling to another planet.

Deathworld centers on Jason dinAlt, originally from an agrarian planet Porgorstorsaand, a professional gambler who uses his erratic psionic abilities to tip the odds in his favor. While on a gambling trip to the casino on the planet Cassylia, he is challenged by a man named Kerk Pyrrus (who turns out to be the ambassador from the planet Pyrrus) to turn a large amount of money into an immense sum by gambling at a government-run casino. He succeeds and survives the planetary government's desperate efforts to steal back the money. In a fit of ennui, he decides to accompany Kerk to his home, despite being warned that it is the deadliest world ever colonized by humans.

  • This answers your point on the planet's animals being capable of attacking.

Everything on the planet is predatory, and capable of killing an unwary human instantly. All large animals are strong enough to destroy small vehicles. All small animals have neurotoxic venom. All plants are carnivorous, even if only by default—their victims fertilize their soil. All microorganisms consume insufficiently protected tissue as quickly as acids. On top of this, all the aforementioned life evolves so quickly that even Kerk and his Pyrran crew have to be retrained upon their return from Cassylia in order to survive.

  • This answers your point on the signal-like device.

Jason has the grubbers guide him back to the city, so he can see it from the outside. There his psionic senses confirm his hypothesis. Every species of native flora and fauna is psionic, and all life around the city is telepathically "shouting" the same thing: KILL THE ENEMY! Pyrrus' biosphere is intentionally attacking the city.

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    This is clearly the right answer, but you might mention that the question was wrong in one respect: The people the protagonist is visiting is also humans. The are trying to establish a colony on this planet and not doing too well. The other people they visit are also humans but living "in harmony with nature" and hence not attacked. – Stig Hemmer May 30 '17 at 7:58
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    I think the novels are also available on Gutenberg - you could link that as well. – Gallifreyan May 30 '17 at 10:02

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