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The eyes (anterior lateral and median) of a jumping spider photographed in reflected light by Walter Piorkowski. Marie Herberstein, a behavioral ecologist at Macquarie University in Sydney, Australia, is convinced that the spiders gain a sense of depth by comparing the clear and fuzzy images projected on the different layers of their complicated retinas.

geneticist: Sperm production in the seminiferous tubules, the tails are blue and the heads are green. (source)

Butterfly egg - photographed from an ant-eye view, making the less-than-2-millimeter eggs look other-worldly. Using a scanning electron microscope, National Geographic and Prüftechnik Uri and School of Applied Sciences, FHNW, show us what the beginnings of life look like for bugs.