We’ve talked about jumping spiders before here on Webvision as they are an amazing animal with very well developed vision. However, their retinas and visual pathways are very different from the vertebrate retinas in that they use image defocusing for depth perception rather than parallax like humans and other vertebrates do. Figuring out spider vision has been a long standing effort by a small group of scientists and one of the problems of observing spiders is figuring out how they scan. The movie above however shows a transparent jumping spider with the pigment cells in its eyes/retinas moving while they scan an image. There is another pretty impressive movie here, showing a microscopic view into the retina of a living jumping spider.