A passerine bird of the Weaverbird family (illustration). It is smaller than a sparrow, with a total length of about 13 cm. Sexes are heterochromatic. The male's reproductive plumage is reddish orange overall, with a black face and abdomen, and brown wings and tail. There is an orange collar-like ornament on the hind neck. In non-reproductive plumage, males and females are similar, with a light yellow-brown body with scattered dark vertical stripes. It is widely distributed in sub-Saharan Africa. It is often found in grasslands near water, where it feeds on grass seeds. It can appear in large flocks on cultivated land, causing great damage to crops. It breeds in groups on grasslands and reed beds, and males are highly territorial, displaying by ruffling their neck ornaments and hovering in the air while making a buzzing sound. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
スズメ目ハタオリドリ科の鳥(イラスト)。スズメより小さく,全長約13cm。雌雄異色。雄の生殖羽は全体に赤みの強いオレンジ色で,顔と腹部は黒く,翼と尾は褐色。後頸(こうけい)に襟巻状のオレンジ色の飾羽がある。非生殖羽の雄と雌は似ており,淡黄褐色に暗色の縦斑が散在している。サハラ砂漠以南のアフリカに広く分布している。水辺の草原に多く,草の種子を食べる。農耕地に大群で現れ,穀物に大害を与えることがある。草地やヨシ原に集団で繁殖するが,その中で雄は強いなわばり性を示し,首の飾羽を逆立て,羽音を立てて空中停止をしながらディスプレーをする。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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