Fruiting bodies of a slime mold.
Although they reproduce with spores like fungi, they are actually amoeba. In their mobile state they can move over an inch per day in search of microorganisms to feed on.
Only the most efficient pathways between food sources are maintained once found, an ability that has been utilized in biomimicry experiments to help solve spatial design problems. These include mapping a more efficient rail system in Tokyo as well as global trade routes and even imitating rush hour.
Anyone know an ID on this? Found some conflicting sources... (3/3)