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Whose Poo?

机译：谁的便便？

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With a four-foot wingspan, the Eurasian eagle owl is a big bird with a big appetite-and a fecal output to match. Yet the owl's body waste does not always go to waste. New research suggests that breeding eagle owls defecate strategically, using their excrement to erect "No Trespassing" signs within their territories.rnVincenzo Penteriani and Maria del Mar Delgado of the Donana Biological Station in Seville, Spain, report that when breeding eagle owls answer the call of nature, they squirt their white feces onto the vertical faces of dark rocks in exposed locations, rather than onto more abundant-but less contrasting-pale rocks. When not breeding, the owls let go indifferently onto the ground. After the two scientists erased feces on both exposed, dark rocks and more inconspicuous spots by spray-painting over them, they noted that the owls only re-marked the exposed, dark rocks, usually within a day.rnAmong eagle owls, fights between territory owners and intruders are nasty and often fatal, so it pays to advertise owner-rnship clearly. In fact, the scientists say the owls may postrna second form of signage: they lay out the brightest feathers of their avian prey at plucking sites, something they never do with the dull fur of their most frequent victims, rabbits.
机译：欧亚雕eagle的翼展为四英尺，是一种食欲大的大鸟，而且粪便的产量与之相当。然而，猫头鹰的身体浪费并不总是浪费。新的研究表明，that的粪便可以在其领土内竖起“禁止侵入”的标志，因此具有战略意义地进行排便。西班牙塞维利亚Donana生物站的Vincenzo Penteriani和Maria del Mar Delgado报告说，breed的繁殖可以回答在自然界中，他们将白色的粪便喷到裸露的岩石垂直表面上，而不是喷到更丰富但反差较小的苍白岩石上。不繁殖时，猫头鹰会毫不动摇地放到地上。两位科学家通过喷漆擦除了裸露的深色岩石和更不显眼的斑点上的粪便后，他们注意到猫头鹰通常在一天之内才重新标记裸露的深色岩石.rn所有者和入侵者很讨厌，而且往往是致命的，因此，明确宣传所有者的所有权是有必要的。实际上，科学家们说，猫头鹰可能会张贴第二种标牌：它们在拔毛处铺上鸟类猎物最明亮的羽毛，而对于最常见的受害者兔子来说，它们从来没有做过这些枯燥的毛皮。

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    《Natural history》 |2008年第9期|12|共1页
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