Black-bellied Tree-Duck (Dendrocygna autumnalis) Science Article 1 abstract There are two distinguishable subspecies of the Black-bellied Whistling-Duck, one in South America to eastern Panama and one from western Panama through Central America to the southernmost United States. The type locality of the species is the West Indies, but there is little evidence that birds from […]
A Black and White Warbler’s Nest with Eight Cowbird Eggs
Black-and-white Warbler (Mniotilta varia) Science Article 1 abstract In an oak-hickory woodland about three-quarters of a mile southeast of Half Moon Lake, Washtenaw County, Michigan, I found, on May 16, 1949, a nest of the Black and White Warbler GEORGE W. BYERS, Wil. Bull. 62, 3 1950 Download article download full text (pdf)
Habitat use, home ranges and census techniques in the Black Woodpecker Dryocopus martius in the Alps.
Black Woodpecker (Dryocopus martius) Science Article 1 abstract We focused upon habitat use and home range size variation in an alpine population of the Black Woodpecker Dryocopus martius. Habitat selection analyses showed that the dominant local forest type, i.e. Mountain Pine Pinus mugo uncinata, was significantly avoided. Scots Pine Pinus sylvestris stands were positively selected, […]
Black Vulture Nesting, Behavior, and Growth
Black Vulture (Coragyps atratus) Science Article 1 abstract Black Vultures (Coragypsa tratus) have nestedf or 5 consecutivey r (1975-1979) on a small island in Gatun Lake, Panamir. The 1975 nest site (McHargue 1977) was 6 m from nests of the following 3 yr, which were all within 1 m of each other. The 1979 nest […]
Allopreening in the Black Vulture
Black Vulture (Coragyps atratus) Science Article 2 abstract Black Vultures (Coragyps atratus) regularly feed on offal during low tide on the muddy shore of the Surinam River in the center of Paramaribo. At high tide they rest on roofs of buildings along the waterfront where they spend the time sunning in a very upright stance […]
Black Tern (Chlidonias niger surinamensis):A Technical Conservation Assessment
Black Tern (Chlidonias niger) Science Article 1 abstract The black tern (Chlidonias niger surinamensis) still occupies most of its former range. The continental population likely numbers in the low to mid hundreds of thousands and appears stable within the habitat that remains. However, given the severity of previous declines, conservation of the black tern still […]
AGE AND SEX DETERMINATION IN BLACK SKIMMER CHICKS
Black Skimmer (Rynchops niger) Science Article 4 abstract Post-natal development was studied in 40 southern California Black Skimmer (Rynchops niger) chicks in order to develop a reliable method of aging and sexing pre-flying young in this sexually dimorphic species. Ages of chicks were determined from hatching dates and were calculated also from wing chord measurements. […]
Overwintering of Black Skimmers in California:: Site Fidelity and Inter-Site Movements
Black Skimmer (Rynchops niger) Science Article 3 abstract During the last two decades, Black Skimmers (Rynchops niger) have become increasingly common along the southern California coast.They are now found year-round in southwestern California (Collinse t al. in press) and in northwestern Baja California (Palacios and Alfaro 1992). Little detailed information has been published, however, about […]
NESTING BIOLOGY OF BLACK SKIMMERS, LARGE-BILLED TERNS, AND YELLOW-BILLED TERNS IN AMAZONIAN BRAZIL
Black Skimmer (Rynchops niger) Science Article 5 abstract Nests of Black Skimmers (Rynchops niger) (n = 37), Large-billed Terns (Phaetusa simplex) (n = 121), and Yellow-billed Terns (Sterna superciliaris) (n = 16) on an exposed sandbar in the Trombetas River, Brazil, were monitored during incubation and hatching in 1982. The species were interspersed throughout the […]
Diurnal and Nocturnal Visual Function in two Tactile Foraging Waterbirds: The American White Ibis and the Black Skimmer
Black Skimmer (Rynchops niger) Science Article 2 abstract We compared the diurnal and nocturnal visual function in two tactile foragingwaterbird species, the red subspecies of the American White Ibis (Eudocimus ruberruber, formerly the Scarlet Ibis), which is known to feed exclusively during daytime, andthe Black Skimmer (Rynchops niger), which forages primarily during darkness. Live birdswere […]