Disgorgement among Song Birds

The Auk ◽  
1897 ◽  
Vol 14 (3) ◽  
pp. 318-319 ◽  
Author(s):  
Joseph Grinnell
Keyword(s):  
Song Birds

American song-birds

1942 ◽  
Vol 182 (20) ◽  
pp. 279-280
Author(s):  
Charles Duffy
Keyword(s):  
Song Birds

Directory of Australian Birds: Passerines

1999 ◽  
Author(s):  
R Schodde ◽  
IJ Mason
Keyword(s):  
Biodiversity Indicators ◽  
Wide Context ◽  
Australian Birds ◽  
Song Birds ◽  
Bird Fauna ◽  
Baseline Information ◽  
Regional Population

Recent classifications of Australian birds have been limited to lists of "species" which are inadequate as biodiversity indicators. The Directory of Australian Birds: Passerines fills a huge gap in ornithological knowledge by separating out and listing not only 340 species of song-birds but also the 720 distinct regional forms. Covering about half the national bird fauna, the Directory provides science and the community with baseline information about what bird it is and where it lives in an Australia-wide context. Identity is taken down to the level of distinct regional population. No other compendium on Australian birds does this.

Australian Song Birds

1926 ◽  
Vol 25 (4) ◽  
pp. 302-303
Keyword(s):  
Song Birds

American song birds

1942 ◽  
Vol 182 (19) ◽  
pp. 263-263
Author(s):  
Constance Williams
Keyword(s):  
Song Birds

The Song Birds of Germany. (Die Singvögel der Heimat. Neunte Auflage)

Bird-Banding ◽  
1952 ◽  
Vol 23 (1) ◽  
pp. 50 ◽  
Author(s):  
D. S. Farner ◽  
Otto Kleinschmidt
Keyword(s):  
Song Birds

Spectral Density of Polarimetric Variables Separating Biological Scatterers in the VAD Display

2007 ◽  
Vol 24 (7) ◽  
pp. 1186-1198 ◽  
Author(s):  
Svetlana Bachmann ◽  
Dusan Zrnić
Keyword(s):  
Spectral Densities ◽  
Spatial Continuity ◽  
Wind Speeds ◽  
Spectral Peaks ◽  
Song Birds ◽  
Ensemble Statistics ◽  
The Mean ◽  
Spectral Velocity ◽  
Echo Type ◽  
Processing Techniques

Abstract Echoes in clear air from two types of biological scatterers mixed within the resolution volumes over a large region, observed with S-band dual polarization radar, are presented. This case occurred in the evening of 7 September 2004, at the beginning of the fall migrating season of song birds (passerines). Polarimetric spectral analyses are used for distinguishing birds and insects in multimodal spectra. Spatial continuity of spectral peaks shows clear separation of insect (wind) speeds from bird speeds. Spectral densities of polarimetric variables exhibit vastly different values at speeds corresponding to insects than from those of birds, allowing the separation of the two scatterer types. Therefore, the statistics of the intrinsic polarimetric variables computed from spectral densities are unbiased and closer to the ensemble statistics of the echo type than the ones obtained with standard processing techniques. A novel display of the spectral densities versus azimuth, termed spectral velocity–azimuth display (SVAD), is constructed for easier viewing and interpretation of the velocity field. Analyses of the SVADs reveal the mean velocities and the directions of the two types of scatterers.

scholarly journals An unexpected advantage of insectivorism: insect moulting hormones ingested by song birds affect their ticks

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Sándor Hornok ◽  
Dávid Kováts ◽  
Barbara Flaisz ◽  
Tibor Csörgő ◽  
Árpád Könczöl ◽  
...  
Keyword(s):  
Song Birds ◽  
Moulting Hormones
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