Snapping shrimp (Family Alpheidae, genera Alpheus and Synalpheus) are arguably the most soniferous animals in the ocean, with dense colonies producing an audible crackle in tropical to temperate coastal habitats globally. Their persistent snapping is the common feature of shallow-water reef soundscapes, with dynamic and variable patterns in snap production across multiple scales. Environmental factors known to influence snap rates and spatiotemporal patterns include temperature, pH, wind, lunar phase, and light, yet unpredictable variation in shrimp sounds over multiple scales often defies explanation based on current ecological knowledge. This chapter presents the first exploration of snapping shrimp sound patterns in soundscape data collected on eastern African reefs, an ecoacoustically understudied region. Snap analysis of datasets from Mozambique and Tanzania confirms the prominence of snapping shrimp in coastal soundscapes in the Western Indian Ocean, comparable to other tropical and subtropical reefs worldwide. Shallow reef soundscapes showed high snap rates (1000–4000 snaps/min) with diel cycles of variable strength and consistency, depending on site, season, and year. For some case studies presented, snap rates correspond to spatial and temporal variation related to conservation status and habitat health (e.g., level of protection, coral bleaching events); however, the results further underscore the need for fundamental research in snapping shrimp ecology and biology (including taxonomy) to adequately interpret acoustic patterns in an ecological context and apply them to monitoring programs.