Summary

His tiny limbs twitch, his chelicerae tremble, his retinas flutter back and forth as though tracking the motions of something that isn't actually there. He is Portia fimbriata – the fringed jumping spider – among the most intelligent of the Araneads. And his nocturnal behavior, scientists say, is the best evidence yet that spiders undergo a distinct stage of REM-like sleep.

AI summaries can be wrong sometimes—always verify important details using the source article.