Oglaroonian

Oglaroonians are an "intelligent" (sic) species native to the large forested planet of Oglaroon. A common trait of sapient life (that of dealing with the universe's unimaginable vastness and weirdness through simply ignoring it) is taken to the extreme by the Oglaroonians. Though the entire planet is habitable, Oglaroonians confine the whole of their civilization to within one single, extremely crowded nut tree; and within it they live, love, create art, philosophy, and even fight wars. Any Oglaroonian who commits the heresy of suggesting that there might be life beyond that one tree; or even defy the widespread idea that the other trees are no more than hallucinations caused by eating too many oglanuts; will be immediately banished.