People from Earth (I believe) settled for some reason I forgot on a planet where they were in constant danger. Everything was carnivorous, including plants, even trees.
In fact, the only way to survive a night was to climb into a certain tree. The tree was in fact also carnivorous but vey slow, so in the morning you could disentangle yourself from the tendrils it had started to extend to strangle you. But you had to be very careful before climbing into one because there was another species that looked very similar but was quick and would kill you.
One other danger were blobs of protoplasm that would roll and dissolve everything they met. These were easier to dodge, because they would more or less go in straight line but would deviate in the direction were the amount of food was largest. One could even get rid of them by trapping them along a line with a lot of food ending up in an empty place where they would starve.
I forgot almost everything else, I'm sorry...