Photo: Didier Descouens
The Hercules beetle, Dynastes hercules, is able to change its color from a greenish yellow to black and back. How does this occur?
This color changes was investigated by H.E. Hinton and G.M. Jarman*. They discovered that the color was due to the way elytra reflected light. The elytra have a transparent hard top layer and a spongy layer underneath. When the spongy layer is filled with air, the elytra reflect the yellow color. If the spongy layer is…
Source: Living With Insects Blog