Things like this happen all the time in the jungle. It's survival of the fittest.
5 seconds sound clip from the Cannibal Holocaust movie soundboard.
You can hear this line at 01:06:22 in the Blu-ray version of the movie.
Quote context
[...]
- It's not the best way of establishing peace with the Yacumo tribe.
- I'm beginning to understand why they greeted us with such hostility.
- Do you think this is bad? This is nothing. Alan did much worse. Just watch.
- Here we are at the end of the world in human history.
- Things like this happen all the time in the jungle. It's survival of the fittest.
- In the jungle it's the daily violence of the strong overcoming the weak.
- The massacre of the Yacumos by the Yanomamos.
[...]