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首页> 外文期刊>Birds New Zealand >Formidable carpal weaponry of Anas chathamica, Chatham Island’s extinct flightless duck
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Formidable carpal weaponry of Anas chathamica, Chatham Island’s extinct flightless duck

机译：查塔姆岛上绝种的不会飞的鸭子Anas chathamica的强大腕部武器

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The Chatham Island duck (Anseriformes: Anatidae: Anas chathamica) had a pronounced and rugose enlargement to the tip of the processus extensorius at the proximal end of its carpometacarpus. This “carpal knob” was the equal in size of those found in some much larger waterfowl (e.g., steamer ducks, Tachyeres sp.), and was disproportionately larger than those of all other New Zealand waterfowl. The knobs on 20 carpometacarpi examined all showed evidence of continuous bone deposition at their tips and their use as weapons is implied. Comparisons with other duck species having similarly prominent and rugose carpal knobs suggests the Chatham Island duck maintained long-term pair bonds and occupied combined feeding and breeding territories year-round which both sexes defended belligerently.
机译：查塔姆岛鸭（Anseriformes：Anatidae：Anas chathamica）在其腕果的近端有明显的，有皱纹的伸肌突端。此“腕knob”的大小与一些更大的水禽（例如，蒸鸭，Tachyeres sp。）中发现的大小相同，并且比所有其他新西兰水禽大得多。检查的20个腕果上的旋钮均显示出尖端连续骨沉积的证据，并暗示了其用作武器。与其他具有类似突出腕部和皱纹的鸭种的比较表明，查塔姆岛鸭群保持了长期的成对联系，并全年占据着饲喂和繁殖地区的合并，这两个性别都为好战者辩护。

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