This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Darwin Earthworm Fig. . en Towerlike casting from near Nice constructed of earth inches high voided probably by species of Perichaeta copied from photograph de Turmfrmige bis zu neun Zentimeter hohe ErdAusscheidungen aus der Nhe von Nizza gezeichnet nach einer Fotografie von Darwin der Gruppe Perichaeta zugeordnet Charles Darwin