The first H5N8 outbreak among poultry in the Netherlands occurred on November 25, two weeks after the first detection in wild waterbirds and coinciding with increasing death reports in Eurasian wigeons.
After potential double-counts were excluded as much as possible, [approximately equal to]13,600 wild birds of 71 species were reported dead (Table); 49% of all carcasses were identified by species, most of which were tufted duck (Aythya fuligula [39%]) and Eurasian wigeon (Anas penelope [37%]).
The sex ratio of Eurasian wigeons in Poyang Lake was balanced and had slight differences compared with the female-biased sex ratio in Tai-hu Lake and the male-biased sex ratio in the UK and Denmark (Table I, III).
The common teal mainly breeds in Europe and northern Asia; the falcated duck mainly breeds in southeast Siberia, Russia and northeast Asia; the Mallard and Tundra swan mainly breed in northeastern China; and the Eurasian wigeon breeds in northern Eurasia (Zhao, 2001).
During the winter months the skies fill with visiting waterfowl such as pink-footed geese and wigeons
, not to mention birds of prey that can set flocks wheeling over the marshes.
By the third week of October migrant wigeon, gadwall and divers begin to show up.
Bill took a dandy drake and I connected on a drake gadwall as it sucked toward the mixed mallard and wigeon blocks.
The ducks could be divided into a high-excretion group consisting of tufted ducks, pochards, and mallards, and a low-excretion group consisting of teals, wigeons
, and gadwalls (Figure 2, panels B and D).
When he returned, Turner told him an approaching hawk had spooked many of the wigeons
, but the bird in which he was interested remained on the water.
Mallards, pintails and a few of Tony's favorite wigeon
flew into our gun barrels with reckless abandon.
A Eurasian Wigeon
on the left, female, young," he whispers, and takes a shot of it with his Nikon.