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
The Little Girl Found a resolution to The Little Girl Lost, this poem shows the fulfilling of Blake's image of the 'desert wild become a garden mild'; the parents' perceptions of nature have changed, and they no longer fear their natural surroundings. Blake uses this to demonstrate that positive change away from corrupt experience is possible, but only through an acceptance of that which is natural. Crucially, this poem gives hope in the surrounding bleak view of Songs of Experience, and is an effective example of a retreat into nature to learn and develop, an important motif in pastoral literature. The Little Girl Found