Deathworld

Pyrrus was a planet where all life forms--plant and animal alike--had evolved into killers. Five minutes in a meadow on Pyrrus was like a century of global war on most worlds. The people of Pyrrus all lived in one barricaded city, huddled against the killer planet's endless terrors. It was only a matter of time until the planet overcame its people's defenses. Jason din Alt came to Pyrrus with a reputation as a gambler. Saving himself and the people of Pyrrus would require the biggest gamble of his life. This book contains the original text as first printed in Astounding Science Fiction digest magazine.