Attributes / relations provided by
♦ ¹Diet comparison of four ray species (Raja clavata, Raja brachyura, Raja montagui and Leucoraja naevus) caught along the Portuguese continental shelf, Inês Farias, Ivone Figueiredo, Teresa Moura, Leonel Serrano Gordo, Ana Neves and Bárbara Serra-Pereira, Aquat. Living Resour. 19, 105–114 (2006)
♦ ²An estimate of summer food consumption of six seabird species in Iceland, K. Lilliendahl and J. Solmundsson, ICES Journal of Marine Science, 54: 624–630. 1997