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. Examples: 914092, 914093

Type B

Variant 1: an agonistic call. Often a long sequence of FM components. Example: 928080, 931401, 928927, 920371 
Variant 2: roosting sounds. Recorded in the vicinity of a roost. Example: 914301

Type C

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

Type C.d: used as advertisement, agonistic or in chase. In this particular case it is defensive behavior towards food resources. The call is an FM sweep with a hook at the start, giving the overall shape a resemblance of a walking stick. Example: 911253 

Type C.i: used in mother/infant communication and interaction within the roost. Can vary from U-shaped calls to FM sweeps, to FM-qCF sweeps or qCF warbles. Examples: 914092, 914301, 914302

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

Literature list:

- 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.