Both species typically breed in small groups: the Mascarene martin builds a shallow cup nest of twigs and coarse plant material with a soft inner lining, whereas Brazza's martin makes a small heap of soft material such as feathers or dry grass at the end of a typically 50-cm (20-in) tunnel in a riverbank. The normal clutch is three eggs for Brazza's martin, two for Mascarene martins on Madagascar and Mauritius, and two or three for those on Réunion. As with other swallows, both martins feed on flying insects, hunting in single-species groups or with other swallows and swifts.