black otter lying on its back on a dirt surface in what appears to be an enclosure at a zoo or wildlife center

black otter lying on its back on a dirt surface in what appears to be an enclosure at a zoo or wildlife center. The otter is mostly black but has some patches of light-colored fur on its underside. It is using its paws to groom its face and neck. The ground is a mix of dirt, small rocks, and some straw. There are some rocks and a small tree branch nearby, with moss visible on the rocks. The video is taken from behind a glass barrier. There is the faint sound of voices in the background.