Resumen de Agonistic interaction between a Nightjar (Caprimulgus europaeus) and a Red-necked Nightjar (Caprimulgus ruficollis)

José Luis Copete, Lluís Gustamante

• On 20th August 1989 we observed an agonistic interaction between a Nightjar Caprimulgus europaeus and a Red-necked Nightjar Caprimulgus ruficollis at l'Almadrava (Tarragona, NE Spain). This seerns to be the first record of such behaviour between the two European species.