In the past, the Conker Tree Scientists have looked to see whether tiny little parasitic wasps can act as natural pest controllers. In 2012 people began contacting us telling us about another possible pest controller: blue tits. Several people had seen tit flocks (mostly blue tits, but also great tits) feeding on the leaves of infested horse-chestnut trees.
Could blue tits act as pest controllers of this alien leaf-mining moth? We set up the Mission: Bird Attacks (up to 2013) to find out. You can still look for evidence of bird attacks on horse-chestnut leaves and record them.