Domestic ducks and geese trace back to two species of waterfowl each: the mallard duck (Anas platyrhynchos) and the muscovy duck (Cairina moschata), the greylag goose (Anser anser) and the swan goose (Anser cygnoides). Ducks and geese were known in ancient China and Egypt, where they had already

, Bean Goose Anser fabalis and Brent Goose Branta bernicla). Despite the different composition of the two bird assemblages, there are similarities in the human traces left on the bones. A thorough analysis of all the bones of Anseriformes was carried out with an optical microscope. This was done so

Abstract — Determining the position and velocity of mobiles is an important issue for hierarchical cellular networks since the efficient allocation of mobiles to large or microcells depends on its present velocity. In this paper, we suggest a method of tracing a mobile by evaluating subsequent

migratory water birds including Pallus Gull, Heuglins Gull, Bar-headed goose, Comb Duck and Spot Billed Pelican. The samples are analyzed chemically to trace the nutrient compositions and the related

combination of time budget and mass balance models for birds, bioassays of phytoplankton growth, and stable isotope methods that trace the source of nitrogen to food webs. Geese increased the nutrient loading rates in some wetland ponds by up to 40 % for total nitrogen and 75 % for total phosphorus. Bioassays

by intraventricular landmarks. Secondly, the mitral valve echoes in cases where there are dense attachments of the mitral leaflet to the crest of the interventricular septum may be traced to the rightward and anterior border of the left ventricular outflow tract. This is the echocardio-graphic representation

The egg-rolling behavior of the graylag goose is an often quoted example of a fixed-action pattern. The bird will even attempt to roll a brick back to its nest! Despite excellent visual acuity it apparently “takes a brick for an egg. ” Evolution optimizes utility, not veridicality. Yet textbooks

pre-Mesozoic ocean chemistry, carbon cycling, and global change is derived from isotope and trace element geochemistry of platform carbonates. Paleomagnetic data from the same sediments would be invaluable, placing records of pa-leolatitude, paleogeography, and perturbations to the geomagnetic field

this complexity, Williams helped his readers get some kind of grip on the word by tracing its etymology back to the idea of cultivating crops or rearing animals. This provided the basis for its metaphorical use from around the sixteenth century to signify 'a process of human development', (1983a: 87f