Iridescence in insects

Iridescence is when surfaces – such as the wings of butterflies – appear to change brightness and colour as the angle of view, or the angle of illumination, changes. The iridescent wings of Morpho butterflies are some of the best examples. The spectral reflectance changes with the angle of incidence – i.e. the viewing angle…

Flies blowing bubbles

The first time I saw a fly with a droplet of water protruding from it’s mouth (or the tip of the proboscis) I was quite surprised. Why would a fly be blowing bubbles like this? It turns out that flies do this to cool down!  They move a droplet of fluid in and out and…