Do not watch if spiders or spider-like creatures give you nightmares

Hairy carpet of daddy long-legs form “mossy patches” on trees
[Via Boing Boing]

Happy Smurf Day sez, “I ran across these weird mossy patches on some trees near the border of Mexico and Arizona. Upon closer inspection they turned out to be thousands of spiders clustered together.”

Indeed they are. I love spiders, really and truly I do, but SQUICKSQUICKSQUICK.

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Of course, as a scientist, I want to know what they are doing there in the first place? Keeping warm? Sex? Eating? Just hanging out?