Major roads have a negative impact on the Tawny Owl Strix aluco and the Little Owl Athene noctua populations - Silva, Clara; Lourenço, Rui; Godinho, Sérgio; Gomes, Edgar; Sabino-Marques, Helena; Medinas, Denis; Neves, Vânia; Silva, Carmo; Rabaça, João; Mira, António (2012)