No one quite knows what turns the lugworm on. Salmon are all about the familiar sight of their own spawning beds. Amphibians prefer the sultry glow of a full moon. Dogs dig the rain (though most other times are probably fine, too.
) For human beings, all you need is Marvin Gaye. Female spiders like a good meal, and preferably with a big male with hairy legs. But the lugworm has scientists stumped.Lugworms are rust-colored and grow up to nine inches in length or more, with bodies ridged like an earthworm’s. Unlike earthworms, they have bristles running down their sides, and eleven pairs of feathery gills for breathing. Mating is, for the lugworm, a strictly remote activity. Males cast their sperm out into the world, where it…
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