vulturesshorebirdsGuinea-BissauBijagosTimneh parrotsHooded vultureornithologyecologyconservation biologyGyps africanustrophic webintertidal ecosystemsSpecies distribution modellingSpatial EcologyMohamed HenriquesMohamed HenriquesMohamed BaldéMohamed Romero-HenriquesMohamed Romero Henriques