Dataset for “Nest depth and height are associated with breeding outcomes in the Small Bee-eater (Merops orientalis)

This dataset contains field measurements collected from 38 natural nests of the Small Bee-eater (Merops orientalis) during one breeding season along the Ballar Stream, Pakistan. The file includes nest cavity measurements, distances to nearby habitat features, and breeding outcomes recorded during nest monitoring. The dataset supports analyses of nest site characteristics and their relationship to breeding success in a cavity-nesting bird species.Variable DefinitionsNest_IDUnique numeric identifier for each nest.Cavity depth (cm): Depth of the nest cavity from the entrance to the back of the tunnel (cm).Entrance diameter (cm): Entrance diameter of the nest opening (cm).Nest height (cm): Vertical height from ground level to the nest entrance (cm).Distance to grassland (m): Straight-line distance from the nest entrance to the nearest grassland edge (m). Measured with a laser rangefinder.Distance to electric wire (m): Distance from the nest to the nearest electric wire or power line (m). Measured with a laser rangefinder.Distance to farmland (m): Distance from the nest entrance to the closest agricultural field (m).Measured with a rangefinder when possible; very short distances measured with a tape measure.Distance to town (m): Distance from each nest to the nearest settlement or town boundary (m).Measured with a laser rangefinder.Breeding outcome (1/0): Binary outcome of the nesting attempt:1 = successful (≥ 1 chick fledged)0 = unsuccessful