Click on the following buttons to see all relevant recordings of that specific year:

Type A

Used aggressively while individual bats are in dispute with each other within the roost (Middleton et al., 2020).
Recorded in the vicinity of a roost. Example: 911595, 911592

Type B

Variant 1: an agonistic call. Often a longer sequence of FM components. Example: 910879, 914886 
Variant 2: roosting sounds. Often four to eight components long. Example: 911594, 911593, 911590

Type C

Type C social calls can be classified in subgroups according to their function (Middleton, 2020; adapted from Pfalzer and Kusch, 2003).

Type C.d: used as advertisement, agonistic or in chase. Examples: 911601, 923069, 936309, 998719, 998998, 998988, 998991, 998992 
Type C.i: used in mother/infant communication and interaction within the roost. In this particular case, low frequency qCF warbles. Examples: 911587, 911588 


Modified echolocation: an FM sweep with a hook at the start of the call. Examples: 1001695 

All images on this page are licensed under the following Creative Commons Attribution-NonCommercial-NoDerivs 4.0 license and in courtesy of Sarah Mahie. 

Bibliography:

- G. Pfalzer and J. Kusch (2003). Structure and variability of bat social calls: implications for specificity and individual recognition. Journal of Zoology. 261: 21-33. https://doi.org/10.1017/S0952836903003935

- Neil Middleton, Andrew Froud and Keith French (2022). Social Calls of the Bats of Britain and Ireland (second edition). Pelagic Publishing.