451 research outputs found
Possible steps in the evolutionary development of bird navigation
Hypotheses are presented to explain the evolutionary development of navigational ability in migratory birds. Areas of discussion to describe the possible techniques are: (1) sun compass, (2) bicoordinate navigation, (3) star compass, (4) wind cues, (5) earth magnetic field, and (6) landscape features. It is concluded that landscape is the single most important cue for orientation of nonmigratory birds. The long range migratory birds appear to use a combination of cues with the relative importance of the cue dependent upon the species of the bird involved
Statement on Acid Rain and Waterfowl
Izaak Walton League of Americaunpublishednot peer reviewedOpe
Breeding Populations of Migratory Waterfowl
F33615-84-C-3404; University of Dayton Purchase Order No. R1-43007 issued February 5,
1986Report issued on: issued February 5, 1986INHS Technical Report prepared for unspecified recipien
Proximate and Ultimate Causation of Egg Size and the "Third-Chick Disadvantage" in the Western Gull
This is the publisher's version, also available electronically from http://www.jstor.org/stable/4087093?seq=1#page_scan_tab_contents.No abstract is available for this item
Preferential rating of duck food plants
is peer reviewedOpe
Waterfowl Censuses on the Mississippi River from St. Louis, Missouri, to Cairo, Illinois; 4 December 1974 through 26 March 1975
unpublishednot peer reviewedOpe
Waterfowl Censuses on the Mississippi River from St. Louis, Missouri, to Cairo, Illinois; 19 November 1975 through 12 April 1976
unpublishednot peer reviewedOpe
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