Amy Stewart : Asian insects have killed , killing many in Asian cities . She says they 're traveling great distances for food as their habitats are vanishing . Human beings have long fought off battles in nature , she says . Stewart : The insects are not invasive ; in this case , it is the humans who are .
Amy Stewart : Asian hornets have killed , injured many in Asian cities . She says they 're venturing great distances for food as their habitats are vanishing . Human intrusions have long touched off battles in nature , Stewart says . Stewart : The hornets are not invasive ; in this case , it is the humans who are .