sulawesi scops owl Tangkoko NR 20/07/2023 Wallacea is the name for the biogeographic zone between Wallace’s and Lydekker’s Lines, which trace the Sunda and Sahul tectonic plates of the earth’s crust, respectively. Wallace’s Line marks the eastern boundary of the Oriental fauna region, in which can be found typically Southeast Asian bird groups and other animals, such as elephants, cats, and monkeys. Running between Bali and Lombok, and Borneo and Sulawesi, the line was named after the intrepid British naturalist Alfred Russell Wallace, who helped Charles Darwin to formulate the Theory of Evolution by Natural Selection. In a similar way, Lydekker’s Line marks the western boundary of the Australo-Papuan faunal region, where approximately half of the world’s birds (passerines) originated, and half of the mammal fauna comprises marsupials, such as the wallabies and possums. Wallacea is therefore, at least partly, a transition zone between these two ...
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