UC Davis researchers have discovered that zebras developed their stripes in response to biting flies. Ouch!
They found that the stripes work at keeping the flies away by disrupting the light patterns used by the flies to find food and water.
The article described the biting flies as an annoyance to zebras. I find it interesting that such a peculiar trait would arise from annoyance. Any ideas on why the biting flies would cause such an extreme evolutionary change?