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taken outside of a lodge in Tarangire National Park.
Nymphalidae, Danainae, Danaus chrysippus f. dorippus (or albinus). I would tend to Danaus chrysippus f. dorippus.
http://colnect.com/de/stamps/stamp/27775...
http://www.nature.com/hdy/journal/v80/n4...
I apologie, Daniele, I hate to challenge an ID of yours ;-)...