Appendix S1. External measurements of long-eared bats (Plecotus spp.) in Switzerland. Number of individuals (n), mean, standard deviation (SD), min and max for eight variables (FA: length of forearm, TH: thumb length without claw, TIB: tibia length, HF: hind foot without claw, EARL: ear length, EARW: ear width, TRAG: tragus length and TRAGW: tragus width). All measurements are in mm.

Appendix S2. Description of measurements of ear length (EARL) and width (EARW) in living Plecotus bats: (a), as performed in this study: the ear must be stretched both in length and width along the steel ruler to reach the correct position, which provides maximum values. Ear width was not measured according to the combination of two measures as suggested in Dietz & Von Helversen (2004), but as a single measure, in its broadest section (middle part). Ear length was taken with a ruler first positioned at the base of the ear, inserted in its “V” shape opening, while stretching the ear upwards to its tip. It must be noted here that the maximum ear length and width in living Plecotus are definitely shorter than in dead specimens (b) due to the absence of folds on the distal edge of the ear in the latter individuals.

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