Western jackdaw amounts of silicaceous and calcareous grit to aid digestion of vegetable food and supply dietary calcium. Opportunistic and highly adaptable, the western jackdaw varies its diet markedly depending on available food sources. They have been recorded taking eggs and nestlings from the nests of the skylark ("Alauda arvensis"), Manx shearwater ("Puffinus puffinus"), razorbill ("Alca torda"), common murre ("Uria aalge"), grey heron ("Ardea cinerea"), rock pigeon ("Columba livia"), and Eurasian collared dove ("Streptopelia decaocto"). A field study of a large city dump on the outskirts of León in northwestern Spain showed that western jackdaws forage there in the early morning and
Antipsara is a nesting site of the European shag ("Phalacrocorax aristotelis"), Eleonora's falcon ("Falco eleonorae"), Cory's shearwater ("Calonectris diomedea"), and the yelkouan shearwater ("Puffinus yelkouan"). Antipsara Antipsara () is a small Greek island in the Aegean Sea. Antipsara had 4 inhabitants according to the 2011 census. It lies about west of the larger island Psara, from which its name is derived. Geographic conditions make it inaccessible from the north and west side. Evidence exists of settlement in ancient Greek and Roman times. During the Ottoman rule the island served as a port. Nowadays, tourist trips to the island originate from Psara