Although developing circumstances have forced us to become increasingly aware of the impact our presence has on the world, that doesn't mean we can always predict exactly what that impact will be.
Although the effects of climate change and the persistent threat of poaching are urgent and immediate examples of how human activities can affect the world at large, even our smaller practices can trigger some unexpected reactions from the animal kingdom.
For instance, the BBC reported that enough monkeys have become drunk on the leftover cocktails abandoned by tourists on the Caribbean island of Saint Kitts that they're likely to fight each other and pester visitors for the chance of securing more alcohol.
And those boating off the respective coasts of Spain and Portugal are increasingly finding their vessels damaged by nearby killer whales. However, scientists seem to be getting closer to figuring out why.