Limited song playbacks in 2009 at Laguna Atascosa National Wildlife Refuge, 70 km east of Santa Ana NWR, found that bronzed cowbirds responded to songs of several oriole species and to a more limited extent, the songs of the long-billed thrasher (Toxostoma longirostre), green jay (Cyanocorax yncas), and northern cardinal (Cardinalis cardinalis), all known host species, but not at all to songs of olive sparrows or Couch's kingbirds
(Tyrannus couchii; Gorton, 2010).
Dawn performance reliably signals male morphological features in Eastern Kingbirds
and may be used by females to assess male quality (Murphy et al.
When crows, jays, or kingbirds
spot a hawk, they often mob it because they don't want it around.
, finches, ruddy ducks, herring gulls and yellow-bellied sapsuckers are moving toward the Gulf of Mexico.
I suspected this might be the case when I saw thousands of eastern kingbirds
still in the Amazon two weeks ago, flying through on their way north from Argentina just as they normally do.
His own studies of eastern kingbirds
in North America found that large males that sang early were especially successful in fathering chicks with other males' mates.
Exceptions in June 2008 were Red-winged Blackbirds, which probably nested or foraged in wet wire zones, American Goldfinches, which foraged in wire zones, and Eastern Kingbirds
(Tyrannus tyrannus), which used the towers as perches and possibly as nest sites as at the Green Lane Research and Demonstration Area (RDA) (Yahner et al.
In North America, the Breeding Bird Survey has recently charted a relentless decline of around one percent a year in the population of bobolinks, eastern kingbirds
, Kentucky warblers and wood thrush.
Shrubland birds, such as orchard orioles, willow flycatchers, eastern kingbirds
and brown thrashers, are among the fastest declining bird species in North America due to a reduction in optimum nesting habitat as agriculture and other development change the continent's native landscape.
In addition to stunning waterside vistas, walkers catch sight of rufous-breasted hummingbirds, gray kingbirds
, and other rain-forest denizens that find shelter in the jungle-like surroundings thick with ferns, mosses, and other epiphytes.
Birders usually explore trails on Elliott Key by day, searching for Caribbean specialties such as black-whiskered vireos, gray kingbirds
, or white-crowned pigeons.
Of course, there will be other bleeding hearts this spring, of the human and birdlike variety, including those among the Western kingbirds
- aggressive flycatchers - that don't catch their fill.