Their eyes are fixed, but their retinas seem to move.
Although spiders cannot move their eyes like humans and some mammals, they can move their retinas. Therefore, by observing jumping spiders, the scientists observed the retinal movements of spiderlings as their cobwebs hang themselves with silk threads to rest at night. According to the research team's report, the spiderlings' retinal movement bouts were said to be consistent.
The scientists aren't ready to declare that jumping spiders are dreaming, but Roessler called the possibility "exhilarating." "We need to have a closer look at how universal REM sleep and REM-like behaviors might be across the animal kingdom," Roessler tweeted. "There are likely many things we can learn from this, since even in humans REM sleep is still a big mystery.
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