There are more than a thousand species of Tachinid Fly described in North America. Many of them look like flies. Some of them, like the one I have photographed here walking on a pumpkin, resemble ...
Fruit flies are generally highly susceptible to parasitic wasps, but some have stolen a gene from bacteria that makes them resistant. This adult fly, Drosophila melanogaster, has two cysts (made dark ...
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