Major Roads Have a Negative Impact on the Tawny Owl Strix aluco and the Little Owl Athene noctua Populations - Silva, Clara C.; Lourenço, Rui; Godinho, Sérgio; Gomes, Edgar; Sabino-Marques, Helena; Medinas, Denis; Neves, Vânia; Silva, Carmo; Rabaça, João E.; Mira, António (2012)