The initial goal of these surveys was to collect information about the location of Mangrove Kingfishers (Halcyon senegaloides) for a geolocator study. However, as surveys provided richer information, it was decided to publish this dataset on its own. Each survey refers to a complete presence-only species list (called “event” in the dataset), each recorded over ~1km and during ~1hr. Four surveys were performed successively over a morning from 6am to 10am covering a transect. Each of the 23 transects was repeated once a month (grouping called “session”) from May 2020 to May 2021. The study area covers the habitat between Arabuko-Sokoke Forest and Mida Creek. Surveys were collected by bird guides from the area (Daniel Kazungu, Juma Badi, Kibwana Ali, Saddam Kailo and Mohammed Ali) and organized by Kirao Lennox, Raphaël Nussbaumer and Colin Jackson from A Rocha Kenya. Summary statistics: 23 transects, 11 sessions: 11, 873 events (surveys): 873, 29'195 occurrences (sightings), 217 species.