No one attending the Allegany Nature Pilgrimage this year could have escaped without noticing hundreds and hundreds of Eastern Tent Caterpillars AND hundreds and hundreds of very large and rather attractive (if annoying) flies called Friendly Flies.
A fellow naturalist mentioned that there is a correlation between these two… but didn’t have the exact details, or we got interrupted before he could finish his explanation… so, I googled it… (Have I mentioned how much I love the internet?)
It turns out that the Friendly Fly lays its eggs on the pupa of the Tent Caterpillar which the fly’s larva will eat. While you may find Tent Caterpillars in the woods every year, the population gets very high in cycles of about 10 to 15 years. When their population is high, so is the population of Friendly Flies.
There’s an explanation for everything, I guess!
Read more by clicking –> here.