Abstract
We report the first in situ observation of mating behaviour in the endangered Groovebelly Stingray ( Dasyatis hypostigma ), endemic to the Southwestern Atlantic. Recorded by drone in May 2025 off Ilhabela, Brazil, the event involved one female and four males, lasting ~3 min and comprising close following and pre‐copulatory biting, without agonistic interactions. The interaction comprised a partial behavioural sequence of close following and pre‐copulatory biting, without agonistic interactions between males. This record provides novel insights into the species' reproductive strategy and highlights the value of non‐invasive drone surveys for elasmobranch research.