Researchers played a sountrack to hedgehogs to identify the frequency of sounds they can hear
"I wanted to investigate whether it would be possible to make targeted sound repellers for hedgehogs, because they are declining all over Europe. So we set out to measure the hearing of the European hedgehog for the first time, " says Rasmussen.
— Source: BBC Environment (https://www.bbc.com/news/articles/c8d52n0dnzro)
