If there is anything that the “Planet Earth” miniseries taught us, it’s that there are some very interesting habitats on the earth…and some very bizarre creatures that live there. Take caves, for instance. On this website, Cave Biota, you can catch a glimpse of animals who call caves their home. Sure, there are the familiar characters like bats, but have you heard of blind white crayfish or northern cavefish? Sponsored by Hoosier National Forest and the Indiana Karst Conservancy, Cave Biota is an “evolving webumentary” (or, in plain terms, video clips from a nature documentary produced by Ravenswood Media). You can download each clip separately, and each video has its own subject. These range from “Levels of Cave Adaptation” to “Cave Salamander.” The videos offer visitors to the site a vibrant window into an otherwise hidden world.