Social calls have the function to coordinate the behavior of animals. In the presence of conspecifics foraging Common pipistrelle bats (P. pipistrellus) emitted, in addition to typical echolocation signals, two types of social calls: complex social calls and an as-of-yet undescribed, short, frequency-modulated call type with high terminal frequency, which we term “high frequency social call”. By recording the flight and acoustic behavior of free flying pairs of foraging P. pipistrellus with an array of four microphones we were able to determine their three-dimensional flight paths and attribute emitted calls to particular behavioral situations. Complex social calls were emitted at further inter-individual distances and at large bearing angles to conspecifics, whereas high frequency social calls were produced at significantly shorter distances and at smaller bearing angles. These calls were associated with chasings and the eviction of the intruder. We assume that the emission of both types of social calls by foraging bats reflects a two-stage-process of the occupation and defense of a food patch. Common pipistrelle bats use complex social calls to claim a food patch and switch to agonistic behaviors, including chasings and high frequency social call emissions, when they defend their foraging territory against an intruder.

社交电话具有协调动物行为的功能。在存在特定物种的情况下，除了发出典型的回声定位信号外，还发出了觅食的普通小蝙蝠（P. pipistrellus），还有两种社交电话：复杂的社交电话和尚未描述的，简短的，频率已调高的来电终端频率，我们称之为“高频社交电话”。通过记录觅食的P. pipistrellus自由飞行对的飞行和声学行为使用四个麦克风阵列，我们可以确定其三维飞行路径，并将发出的呼叫归因于特定的行为情况。复杂的社交电话是在彼此之间的距离更远且与特定物种之间的方位角较大的情况下发出的，而高频社交电话是在距离短得多且方位角较小的情况下发出的。这些电话与入侵者的追逐和驱逐有关。我们假设通过觅食蝙蝠发出的这两种社交电话都反映了占领和防御食品补丁的两个过程。常见的长鼻蝠蝙蝠在捍卫其觅食区域免受入侵者侵害时，会使用复杂的社交呼声要求获得食物补丁并转换为激动性行为，包括追逐和高频社交呼声排放。