from

• Lat : 51.4830186248316
• Lon : -0.0491414291988038
• Accuracy : 4.0

to

• Lat : 51.4832074046060
• Lon : -0.0490938186318914
• Accuracy : 6.0

extensions

• Course : 11.92929077148
• Speed : 1.2683267593383800

audio

• Duration : 00:00:16

This mystified Spallanzani; all the evidence pointed towards bats using hearing, but he couldn't understand by which mechanism bats could possibly navigate with their ears.