Ants, Bees, Wasps, and Sawflies

Ants, Bees, and Wasps - Order Hymenoptera
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    Ensign Wasp (Evaniidae) from Cambodia. These unusual-looking parasitic wasps lay their eggs inside cockroach oothacae (egg cases), which hatch into hungry larvae that consume the roach's eggs.
    Ichneumon wasp (Ichneumonidae: Cryptinae) from Wisconsin.
    Most Pseudomyrmex ants (like this one from Costa Rica) are twig nesters, seeking refuge in the hollow stems of a variety of plants. Some have even evolved obligate mutualisms with Acacia trees, defending them from competitors and herbivores in exchange for nectar and protein-rich excretions called Beltian bodies.