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
Frederick Wollaston Hutton in 1891. He was founding President of the Royal Society of New Zealand from 1904 to his death in 1905; he was followed by Sir James Hector. He worked successively at the Colonial Museum, Wellington (1871–1873); Otago Museum, Dunedin (1877–1879); and the Canterbury Museum, Christchurch (1887–1905) Hutton died on the return voyage from England on 27 October 1905, and was buried at sea off Cape Town, South Africa. He is commemorated in the Hutton Memorial Medal and Research Fund, awarded for scientific works bearing on the zoology, botany or geology of New Zealand. Hutton's shearwater ("Puffinus huttoni"), a sea bird,