THE NOCTULE 89 



appreciate when we are unable to hear them. The greater 

 horseshoe locates its flying prey by hearing, and possibly 

 the noctule does the same. When my bats were fully 

 awake a loud noise, such as that caused by dropping a 

 book, kicking the leg of the table, or shouting, caused 

 them no annoyance; but the scratch of lighting a match, 

 a sudden hiss, or similar low note always startled them. 

 It was interesting to note what sounds caused their ears 

 to twitcfr and made them raise their heads. 



