Nature and EnvironmentMy favorite - The Sponge02:50This browser does not support the video element.Nature and Environment12/04/2015December 4, 2015Sponges are animals. And what most of us know as sponges, are really just the skeletons of sponges, says Christian Vaterlaus. He is the owner of a sponge farm in Zanzibar.Copy linkAdvertisement
