A river otter floats down a meandering river, its brown fur slick and glistening in the sunlight. The otter's webbed feet paddle effortlessly through the water, and its streamlined body moves with grace and speed. The otter pauses every now and then to dive beneath the surface, emerging a moment later with a fish in its jaws. As it continues down the river, the otter seems carefree and content, enjoying the simple pleasures of its aquatic world.