Cool trick

By Marina Chicurel PARASITIC wasps siphon off antifreeze from their fly hosts to protect them from chilly winters—a discovery which could improve biological control of pest flies. Nasonia vitripennis wasps deposit their eggs in puparia, the cocoon-like casings of developing flies. When the wasps hatch they feed on the fly pupae. To survive the winter cold, both flies and wasps go into diapause—a form of hibernation in which they accumulate antifreeze compounds. But the wasps don’t go into diapause until up to two months after the flies. To try to explain this,
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