Nature and EnvironmentMy favorite - The SpongeTo view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoNature 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.https://p.dw.com/p/1HHJ2Advertisement