Nanosciences meets ecology: Evolution of stealth nanostructures in insects

It is difficult to imagine a world without vision - eyes are everywhere around us. The evolution of vision has undeniably been one of the most profound events in the history of life on earth. Animals use their visual system to find food, shelter and mates, as well as in myriad other behaviours that enhance their fitness. On the other hand, vision is also an enemy for multitudes of prey animals that are hunted by visually-guided predators. For such prey animals, avoiding being perceived by the visual system of their potential predators is just as vital as is vision for predators. The earth has witnessed billions of prey species through evolutionary time, and today, some of the most striking adaptations are those that prey animals have evolved as a response to selection by predation. 'Camouflage' is an umbrella term that includes strategies to prevent detection or recognition (Ruxton et al. 2018). For instance, many prey match the colours and patterns of the background, i.e., background matching (Endler 1978). Others have colour patterns that break up the appearance of their body, i.e., disruptive colouration (Thayer 1909). Yet others closely resemble objects that are inedible to their predators, i.e., masquerade (Cott 1940). Camouflage can also involve other sensory systems such as olfaction such that chemically camouflaged prey may escape detection (Ruxton 2009).