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Mammoth backyard spider devours bird

another really cool/nerdy thing about spiders is that their legs are moved by some kind of hydraulic mechanism in addition to internal muscles, the muscles cause the legs to constrict (not sure if this is the right word) and they extend their legs by forcing blood through the area. if they lose too much blood they are no longer able to extend their legs. this is also the reason why their legs curl up when thy die

so its like... getting an erection to move your legs?

wow... spiders walk on penises.