For over a century scientists have been observing caterpillars engaging in strange migrations. This condition affects many different species of caterpillar, but the virus specialising in the Gypsy Moth caterpillar has a few extra surprises.
These normally nocturnal creatures would starts venturing out in broad daylight, leaving their normal grazing and reaching up into the open canopy. The change was not a choice, it was forced by an invader. The caterpillars were sick, and a virus was in control.
One single gene has been isolated in the virus which is thought to be the ‘caterpillar control,’ it deactivates the caterpillar’s will to moult, sending the caterpillar on a constant feeding cycle. Making one very hungry caterpillar.