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Best viewed in a maximizes window on a 800 x 600 screen resolution !
Sorry its small print, it's the only way I could work out how to get it on one screen!
It is however also available in MS Word 2 format, already formatted for printing on either A4 or A5, as a 10KB zip file


Distinguishing features of British bats

Most distinguishing in bold and underlined.
  Greater Horseshoe Lesser Horseshoe Brown Long Eared Barbastelle Noctule Leisler's Pipistrelle Serotine Bechstine's Natterers Daubenton's Whiskered Brant's
Nose Leaf YES YES NO NO NO NO NO NO NO NO NO NO NO
Forearm Length in mm then inches 51 - 61
2" - 2 3/8"
35 - 43
1 3/8" - 1 11/16"
34 - 42
1 3/8" - 1 5/8"
47 - 55
1 7/8" - 2 3/16"
36 - 44
1 7/16" - 1 3/4"
38 - 48
1 1/2" - 1 7/8"
28 - 36
1 1/8" - 1 3/8"
48 - 55
1 7/8" - 2 3/16"
38 - 46
1 1/2" - 1 13/16"
36 - 43
1 7/16" - 1 11/16"
33 - 40
1 5/16" - 1 9/16"
30 - 37
1 5/16" - 1 7/16"
31 - 38
1 1/4" - 1 1/2"
Ear basses widely spaced YES YES NO NO YES YES YES YES YES YES YES YES YES
Shape of ears and length (reach if pressed to muzzle)     Long, greater than 28mm, 1 1/8" 20mm, 3/4", wide as long, furry                  
Tragus details No Tragus No Tragus     Broader than long Broader than long Broader than long, finger shaped Longer than broad, tip blunt Broader than long 3/4 lenth of ear, thin and pale Medium, convex Long, Concave outer edge Medium, Convex or straight outer edge
Calcar                     3/4 of length, foot to tail    
Tail, membrane edge         2mm, 3/32" of tail Slight lobe Prominent lobe Shape of lobe, S shaped, 6mm, 1/4" of tail   Hairs from Calcar to tail Fine hairs, membraine attached to ankle Membrane attached to base of toes Membrane attached to base of toes
Hind foot details                     >1/2 shin length <1/2 shin length  
Likely roost site                          
Wingspan in mm then inches 340 - 390
13 3/8" - 15 3/8"
225 - 250
8 7/8" - 9 7/8"
230 - 285
9" - 11 1/4"
245 - 280
9 5/8" - 11"
320 - 390
12 5/8" - 15 3/8"
280 - 340
11" - 13 3/8"
190 - 250
7 1/2" - 9 7/8"
340 -380
13 3/8" - 15"
250 - 300
9 7/8" - 11 7/8"
250 - 300
9 7/8" - 11 7/8"
230 - 270
9" - 10 5/8"
210 - 240
8 1/4" - 9 1/2"
210 - 255
8 1/4" - 10"
Other features                       Obvious Penis, Parallel sided Obvious Penis, Club shaped
Weight in grams then ounces 13 - 34
0·46oz - 1·2oz
4 - 9
0·14oz - 0·3oz
6 - 12
0·2oz - 0·4oz
6 - 13
0·2oz - 0·46oz
19 - 40
0·67oz - 1·4oz
11 - 20
0·39oz - 0·7oz
3 - 9
0·1oz - 0·32oz
15 - 35
0·53oz - 1·24oz
7 - 13
0·25oz - 0·46oz
7 - 12
0·25oz - 0·4oz
6 - 12
0·25oz - 0·4oz
4 - 9
0·14oz - 0·32oz
5 - 10
0·18oz - 0·35oz
Echo location frequency
(optimum, KHz)
85 110 120 40 25 25 45 or 55 35 45 45 45 45 45

Last edited