Spider are apparently absent. In some species, the exocuticle of the legs and prosoma is modified by a tanning process, resulting in brown coloration. Bilins are found, for example, in "Micrommata virescens", resulting in its green color. Guanine is responsible for the white markings of the European garden spider "Araneus diadematus". It is in many species accumulated in specialized cells called guanocytes. In genera such as "Tetragnatha", "Leucauge", "Argyrodes" or "Theridiosoma", guanine creates their silvery appearance. While guanine is originally an end-product of protein metabolism, its excretion can be blocked in spiders, leading to an increase in its storage. Structural colors
European hedgehog European hedgehog The European hedgehog ("Erinaceus europaeus"), also known as the West European hedgehog or common hedgehog, is a hedgehog species found in Europe, from Iberia and Italy northwards into Scandinavia. It is a generally common and widely distributed species that can survive across a wide range of habitat types. It is a well-known species, and a favorite in European gardens, both for its endearing appearance and its preference for eating a range of garden pests. While populations are currently stable across much of its range, it is thought to be declining severely in Great Britain. "Erinaceus europaeus" has a