Figure 2From: Age, season and spatio-temporal factors affecting the prevalence of Echinococcus multilocularis and Taenia taeniaeformis in Arvicola terrestrisAge pyramids of Arvicola terrestris in the canton of Zurich, Switzerland, in different seasons. The single pyramid segments represent the percentage of the population trapped during the corresponding period. Dark grey: males, light grey: females.Back to article page