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The nature and trajectory of coastal and maritime adaptations, and the complex ways foraging economies have been structured to include both marine and terrestrial resources, are becoming key topics of interest in African archaeological research. There is, therefore, an increasing need to understand the longer-term context for more recent shifts in coastal economies, and for greater attention to be paid to the role of a broader spectrum of resources. This is particularly the case for terrestrial and marine molluscs, which have been somewhat overlooked in discussions centred on past 2 economies in the region. The relative importance of these comparatively small-bodied faunal resources requires evaluation, particularly given their ubiquity within the archaeological record, and their potentially important contribution to dietary and economic practices. Kuumbi Cave, located in the southeast of Zanzibar (Unguja) Island, provides the ideal opportunity to investigate long-term trends in invertebrate use on the eastern African coast and islands. Here we discuss not only the trajectory of coastal resource exploitation and coastal economic adaptations in the region from the late Pleistocene, but also the significance of Kuumbi Cave as one of the few sites in eastern Africa that represents significant levels of exploitation of large terrestrial gastropods.

The human colonization of eastern Africa's near- and offshore islands was accompanied by the translocation of several domestic, wild and commensal fauna, many of which had long-term impacts on local environments. To better understand the timing and nature of the introduction of domesticated caprines (sheep and goat) to these islands, this study applied collagen peptide fingerprinting (Zooarchaeology by Mass Spectrometry or ZooMS) to archaeological remains from eight Iron Age sites, dating between ca 300 and 1000 CE, in the Zanzibar, Mafia and Comoros archipelagos. Where previous zooarchaeological analyses had identified caprine remains at four of these sites, this study identified goat at seven sites and sheep at three, demonstrating that caprines were more widespread than previously known. The ZooMS results support an introduction of goats to island eastern Africa from at least the seventh century CE, while sheep in our sample arrived one–two centuries later. Goats may have been preferred because, as browsers, they were better adapted to the islands' environments. The results allow for a more accurate understanding of early caprine husbandry in the study region and provide a critical archaeological baseline for examining the potential long-term impacts of translocated fauna on island ecologies.

The intertidal zone, covering the nearshore fringe of coasts and islands and extending from the high-water mark to areas that remain fully submerged, encompasses a range of habitats containing resources that are as important to modern populations as they were to humans in prehistory. Effectively bridging land and sea, intertidal environments are extremely dynamic, requiring complexity and variability in how people engaged with them in the past, much as they do in the present. Here we review and reconsider environmental, archaeological, and modern socio-ecological evidence from the Zanzibar Archipelago on eastern Africa’s Swahili coast, focusing on marine molluscs to gain insight into the trajectories of human engagement with nearshore habitats and resources. We highlight the potential drivers of change and/or stability in human-intertidal interactions through time and space, set against a backdrop of the significant socio-economic and socio-ecological changes apparent in the archipelago, and along the Swahili coast, during the late Holocene.