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“Pigeon is a part of the daily diet in many parts of Egypt and Pigeon houses, or dovecotes, are constructed from mud brick create an artificial mountainous topography. The droppings are also a valuable source of fertilizer and the houses are so ubiquitous that they are also part of the Egyptian national identity. Thedovecote typology can be found throughout the world and Earth Architecture has previously featured the palomares of Spain. ” - http://www.eartharchitecture.org/index.php?/categories/10-Africa