Butterflies anchor cocoons with silk Velcro and seat-belts

A chrysalis needs to be perfect when a caterpillar or silkworm prepares to transform from pupae to winged adults.Anime Sex Dolls Since the insect can’t emerge until it has completely matured, any overlooked structural flaws or weaknesses may prove fatal for them. But just as important is a chrysalis’ ability to remain anchored in place—and according to a new study, when it comes to metamorphosis, a butterfly’s delicate silk threads are some of its strongest and most reliable tools.Teen Sexpuppen

Researchers at China’s Southwestern University recently studied the life cycles of two butterfly species—Danaus chrysippus (plain tiger) and Papilio polytes (common Mormon)— and two silkworm species.New Sex Dolls When it came time for the butterfly and silkworm caterpillars to build their respective chrysalises and cocoons, the team watched as the insects each spun silk into net-like pads. Using an arm-like appendage called a cremaster, they then attached their chrysalis or cocoon to a branch.

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“The connection between the cremaster and silk pad was observed to be similar to that between the hook and loop of a Velcro fastener, except that the cremaster hook is anchor-shaped rather than being a single hook,” the authors explain their paper published July 22 in ACS Biomaterials Science & Engineering.Riesentitten Sexpuppen “Such a connection will remain secure, ensuring the safety of the pupae during exposure to wind and rain.”