. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 340 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY These include: (a) somewhat generalized seed-eaters, inhabiting the wide areas of the continent covered by grassland savannah, (b) large heavy-billed cockatoos, that either eat the larger seeds and nuts, dig for roots, or else strip the bark from trees in search of wood-boring grubs, and (c) small, nectar-feeding lorikeets that exploit the large blossoms of the dominant Euca- lyptus, GrevUlea, and Banksia trees. MELOPSITTACUS UNDULATUS (nomad). Fig. 9. The influence of noma
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 340 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY These include: (a) somewhat generalized seed-eaters, inhabiting the wide areas of the continent covered by grassland savannah, (b) large heavy-billed cockatoos, that either eat the larger seeds and nuts, dig for roots, or else strip the bark from trees in search of wood-boring grubs, and (c) small, nectar-feeding lorikeets that exploit the large blossoms of the dominant Euca- lyptus, GrevUlea, and Banksia trees. MELOPSITTACUS UNDULATUS (nomad). Fig. 9. The influence of nomadism on geographic variation. Melopsittacus undulatus, the domesticated budgerigah or "parrakeot," is typical of the many interior species that are highly nomadic and breed wherever conditions are propitious. In none of the species with this form of seasonal behaviour does geographic variation or speciation occur. The family Psittacidae is represented by species in all the major vegetation formations excepting mangroves and swamps. The majority of species are sedentary but nomadism is well developed in some of the inland grass-feeders, Leptolophu-s hollandicus and Melopsittacus undulatus (Fig. 9), and in many of the nectar feeders (Trichoglossus and Glossopsitta) that seasonally follow the flowering of the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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