[BirAdam]

From an exceedingly anthropocentric point of view.

People assume that humans are the only or first animal of the Holocene to have left lasting global impacts. The mastodons essentially great swaths of steppe. Ants and worms have essentially altered the grounds. Bacteria generate the bulk of the oxygen. Beavers change the course of rivers and create lakes. The number of critters that alter the Earth is quite numerous. Humans also alter the Earth, and in increasingly large ways, but naming an epoch after humanity seems… egotistical when other critters do stuff equally impressive when scale is factored in.