Red Streetlights
These streetlights don't just make the street look eerier, they also serve a serious purpose. Normal colored streetlights scare bats, but red streetlights help them maintain healthy predatorial relationships with urban areas.
The Octopus
The octopus is one of those creatures that humans have never really understood. Their ability to camouflage and morph into the shape of anything that they're near make them seem like they were dropped from an alien spaceship with no explanation. As far as we know, they might have been.