Plenty of animals build their homes in oak trees. But some very teeny, tricky wasps make the tree do all the work. "What nerve!" you might say. What… gall! And you'd be right. They're called gall-inducers. And each miniature mansion the trees build for the wasps' larvae is weirder and more flamboyant than the next. SUBSCRIBE: http://goo.gl/8NwXqt Even more gall-waspy goodness in the form of a blog post can be found here: http://blogs.kqed.org/science/2014/11... Created by KQED Public Media in San Francisco and presented by PBS Digital Studios.