'Swarming locusts have larger brains than non-swarming locusts.'
One of the most destructive pests on the planet, locusts can, when swarming, cover a fifth of the Earth's land surface, with swarms hundreds of miles across containing tens of millions of locusts per square mile. Most locusts don't swarm, however; the average locust is solitary and not part of a vast migratory group. According to Cambridge scientists, locusts who are kept solitary, while larger, have significantly smaller brains. Though solitary locusts have brains developed for responding to stimuli, swarming locusts are substantially more invested in learning and processing information, to the tune of a brain 30% larger than that of their solitary counterparts.