Trillions of insects buzz and flutter across southern England each year in secret migrations that move the biomass equivalent of 20,000 flying reindeer, scientists have revealed. Trillions of insects buzz and flutter across southern England each year in secret migrations that move the biomass equivalent of 20,000 flying reindeer, scientists have revealed Trillions of insects buzz and flutter across southern England each year in secret migrations that move the biomass equivalent of 20,000 flying reindeer, scientists have revealed.