Capsule: We document previously undescribed nocturnal flight behaviour by Bearded Vultures Gypaetus barbatus using a combination of accelerometer and global positioning system (GPS) information.

Aims: To study the nocturnal flight activity of the Bearded Vulture and determine whether nocturnal flights could be linked to foraging behaviour.

Methods: We used both accelerometer and GPS location data of 11 Bearded Vultures in the Spanish Pyrenees along with 88 carcasses monitored with camera traps.

Results: Over half (55%, n = 11) of the individuals tracked were recorded flying between 0.7 and 6.1 km on at least 19 different nights, including 37% that occurred when less than 20% of the moon was illuminated. Bearded Vultures displayed feeding activity in only 8.2% of the 146 feeding events existing during the hour after dawn and the hour before dusk.

Conclusions: Our findings suggest that foraging benefits do not explain the nocturnal flights. Disturbances or adverse weather conditions may result in the abandonment of an overnight roosting site. This could also explain why individuals recovered in the field showed impact injuries.

胶囊：我们结合了加速度计和全球定位系统（GPS）信息，记录了Bearded Vultures Gypaetus barbatus先前未描述的夜间飞行行为。

目的：研究胡子秃no的夜间飞行活动，并确定夜间飞行是否与觅食行为有关。

方法：我们使用了西班牙比利牛斯山脉的11只胡兀V的加速度计和GPS位置数据，以及使用照相机陷阱监控的88具尸体。

结果： 在至少19个不同的夜晚，记录到一半以上的被跟踪者（55％，n = 11）在0.7至6.1公里之间飞行，其中37％是在不到20％的月球被照亮时发生的。在黎明后的一个小时和黄昏之前的一个小时中，有146次进食事件中，有胡子的秃鹰仅显示出8.2％的进食活动。

结论：我们的发现表明，觅食的好处不能解释夜间飞行。干扰或不利的天气条件可能会导致过夜的栖息地被遗弃。这也可以解释为什么在现场康复的人受到冲击伤害。