“The emerald ash borer … beetles’ larvae feed on the surface layers of the wood of [the ash] tree, cutting off vital supplies of nutrients and water, causing branches and eventually the whole tree to die.” (http://www.bbc.co.uk/news/science-environment-24612322)
The European ash may be bored to death.
“When atmospheric pressure was dropping rapidly, the male beetles became much less responsive to female pheromones.” (http://www.nature.com/news/amorous-insects-predict-the-weather-1.13874)
And yet smut* flourishes in a moist climate**.
*The fungal disease of grains.
**I apologise; it’s raining.
“The more forest grew on and near a coffee farm, the more birds the farm had, and the lower its infestation rates [and] damage by a devastating coffee pest, the coffee berry borer beetle.” (http://www.nature.com/news/birds-protect-costa-rica-s-coffee-crop-1.13689)
The more trees grew, tiddly pom,
The more birds flew, tiddly pom,
The pests that chew, tiddly pom,
“Burying beetles occasionally punish young who nag for food by eating those who pester them most.” (http://www.bbc.co.uk/news/uk-scotland-edinburgh-east-fife-23754861)
Evolution favours second-rate whingers. QED.