Berlin, Germany. 31st May, 2025. 01.06.2025, Berlin. A cuckoo wasp or emerald wasp (Chrysididae) sits on the clay brood tube of a spiny mason wasp. There are over 100 species of cuckoo wasps in Central Europe and all live as parasites. Their hosts are other wasps and wild bees, whose brood is usually parasitized by the larvae of the golden wasps. Credit: Wolfram Steinberg/dpa Credit: Wolfram Steinberg/dpa/Alamy Live News

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