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A moth is an insect closely related to the butterfly, both being of the order Lepidoptera.
For an ecosystem to sustain a butterfly or moth species, it must provide the exact requirements for all stages of its life history (egg, larva, pupa and adult). Butterflies and moths live and breed in diverse habitats, including salt marshes, mangroves, sand dunes, lowland forest, wetlands, grasslands and mountain zones. Rock surfaces and bare ground are critical – they are home to the lichen eaten by the larvae, and offer adults places to bask in the sun.
Despite being notorious for eating clothing, most moth adults do not eat at all. Most like the Luna, Polyphemus, Atlas, Prometheus, Cercropia, and other large moths do not have mouths. When they do eat, moths will drink nectar.
Good guess, I just remembered a Mocis sp. from Asia and there are similar. I do not know any Mocis from Africa (actually I do not know the African leps at all...), but it really looks Noctuidae and Catocalinae.
Mocis sp.
Maybe ''Mocis repanda'', looks very close to the drawing on:
http://en.wikipedia.org/wiki/Mocis_repan...
(I don't know this species "personally")
anotherwise maybe:
Mocis mutuaria (Walker, 1858)
(I don't know that one at all)
I exclude the 3 other mocis from RSA (those I know :) )