cross section of the earth as an of the underground tunnel of a mole. talpa europaea and its shelter. burrow in the

talpa europaea earth transverse section mole underground balls ground soil sunflower autumn museum exposition tunnel fauna subsoil subterranean cave gothic morphology nest sagittal lair systematics animal wildlife hiding place calf science european chamber hill mound permanent burrow biology nature earthworm hole level garden illustration zoology wild cross its shelter mole shelter animal