Analysis shows hippos get all four feet off the ground simultaneously for up to 15% of the time when running at full speed For a brief moment lasting 0.3 seconds per stride, some hippos 'fly' by ...

Many flies are plagued by parasitic wasps, which lay their eggs in fly larvae, turning them into surrogate wombs for wasp larvae. One common fly has successfully fought off its wasp predator by ...

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 ...