I've been working this idea in my head for some time. It is a species of lampposts with the capability of producing pungent and sweet aromas to attract wildlife, to which is disperses its seeds onto said wildlife. This in turn causes these lantern like protrusions to grow out of animals proportional to their size as the RPC's metal roots clamp into its skeleton.
Using photosynthesis, it can deliver nutrients into the animal, nullifying its need to eat while it begins to control the mind of the animal, forcing it and as many of its peers to make a trek to one of 11 - 13(haven't come up with a concrete number yet.) caves located around the planet, to which the animals enter and never return.
Humans who have this RPC grow into them don't exhibit the same behavior, things like: general degradation of the mind, fasting and insanity before the afflicted try to commit suicide by any means possible occur and these symptoms persist until the RPC is either surgically removed, or the afflicted commits suicide or is terminated. Whatever or whoever created these anomalies seemed to have one thing in mind: "Preserve all fauna, except for Humanity." Because Authority research showed that the caves lead into another dimension of which no human can enter thus far.
This is just the surface level, I have a lot more ideas in fleshing this out, so if any of you have any questions, critiques or ideas, I'd be more than happy to hear them before I begin my rough draft!