The Common Blackbird has extended its geographic range in Tunisia recently and colonised oases in the southern part of the country. Here, I examine the role of oasis spatial distribution and local vegetation structure in shaping Blackbird distribution and abundance patterns in the oasis system. I also provide preliminary results on the breeding biology of Blackbirds in their new habitat. Blackbird occurrence in a given oasis was mainly dependent on its presence in neighbouring oases, while vegetation structure did not predict Blackbird occurrence. Within occupied oases, local abundance was associated with the diversity and abundance of fruit trees and herbaceous plants. This suggests that dispersal and colonisation from nearby occupied oases play an important role in shaping oasis occupancy pattern, while local vegetation structure determines the abundance of locally established populations. The abundance of trees affects nest site availability and breeding success, based on observations at two oases. Bla...