Heaviside's dolphins, Cephalorhynchus heavisidii , are endemic to southwestern Africa, where they are exposed to unknown levels of anthropogenic threats, including inshore set netting. Using photo‐ID data collected over 3 yr on the west coast of South Africa, we calculated Chapman's‐modified Petersen estimates of the number of distinctive individuals at three spatial scales. Sample sizes were small and recapture rates low resu...