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Roosting in tree foliage by Common Swifts Apus apus

机译：由普通雨燕Apus apus在树上栖息

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Common Swifts Apus apus have occasionally been reported roosting overnight by hanging in the foliage of trees. However, roosting in foliage, which is often associated with food shortage as a result of adverse weather, appears to be an important alternative to aerial roosting. Thirty-nine observations of the behaviour have been recorded previously in Europe, some of them concerning two or more birds. Furthermore, each August from 1982 to 2000, within a restricted area of c. 300 x 300 m in southern Sweden, Swifts (118 total) were observed to roost in the foliage of trees or on a latticework mast, whereas others (230 total) were observed making 'fly-ins' typical of the behaviour preliminary to roosting. Of those roosting, 39 Swifts could be aged, and all but one of these were newly fledged juveniles. The Swifts perched late at dusk with maximum frequency about 30 min after sunset, but tended to perch earlier in cloudy weather and later in clear weather. Numbers of roosting Swifts were correlated with low mean temperatures in August, and appearances of roosting Swifts were correlated with low local evening temperatures. During May-July 1982-2000, within the same small area, 18 Swifts were observed to roost in this manner and 29 other Swifts made preroost fly-ins. It is concluded that the behaviour is used more frequently and is more widespread geographically than thus far published observations indicate. This applies especially to newly fledged young on their first migration. Adaptive explanations for this are suggested, with the implication that the behaviour may be widespread in swifts of the tribe Apodini.
机译：据报道，常见的雨燕Apus apus悬挂在树的叶子上过夜。但是，在树叶中栖息通常是不利的天气替代，这通常是由于恶劣天气而导致食物短缺的原因。以前在欧洲已记录了39例行为记录，其中一些涉及两只或更多只鸟类。此外，从1982年到2000年的每年八月，在c的限制区域内。在瑞典南部300 x 300 m处，观察到雨燕（总共118个）栖息在树木的叶子或格子桅杆上，而其他人（总共230个）栖息在“飞入”状态，这是栖息之前的典型行为。在这些栖息地中，有39个雨燕可能会变老，除其中之一外，其余都是新近成长的少年。雨燕栖息在黄昏之后，以日落后约30分钟的最大频率栖息，但往往在多云的天气中栖息较早，而在晴朗的天气中栖息。栖息的Swifts数量与8月的平均气温低相关，而栖息的Swifts的出现与当地夜间气温低有关。在1982-2000年5月至7月的同一小区域内，观察到18个雨燕以这种方式栖息，而其他29个雨燕进行了飞巢前飞入。结论是，与迄今为止发表的观察结果相比，该行为被更频繁地使用，并且在地理上更加广泛。这尤其适用于刚出世的年轻人。对此提出了适应性的解释，暗示这种行为可能在阿波迪尼部落的迅速蔓延。

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