 The biological world contains an incredibly diverse variety of individuals. At the ground level of common sense, there are alligators, ants, beetles, marmots, moles, mushrooms, ostriches, roses, trees, and whales. At this ground level, biological individuals are physically-bounded, relatively well-integrated, autonomous agents, the ones listed being amongst those that can be readily detected with the senses. Extending the reach of common sense through magnification allows flagella-propelled protists, tRNA molecules, prions, and bacteria of many kinds to be seen or inferred. At larger or collective scales, there are herds of zebras, sweeping and astonishing coral reefs, algae blooms, biofilms made up of many different species, and even fungus complexes several hectares in area and with masses greater than that of an elephant.