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The Flytrap must have seemed enticing to the Spider. It offered an attractive structure, bound to attract flies. The Spider must have thought it ready-made for his web, as you can see in the picture.
All that promise, though, was little more than a clever trap. There he is, swallowed whole.
Poetic justice from a fly's perspective, perhaps. Or maybe a warning of the dangers of hubris?
More likely, a simple reminder that there's no free lunch.
(Thanks to California Carnivores for selling such well-bred plants; it's worth the drive to Sebastopol, and they ship too.)