Gut microbes may put barrier between species
Removing bacteria in wasps saves crossbred offspring from death
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2013/07/sm_Nasoniavit_feat_0.jpg?fit=860%2C460&ssl=1)
Nasonia vitripennis (shown) and N. giraulti wasps may remain distinct species because of their gut microbes, not just genetics, a new study suggests.
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