Hedgehogs do not like tidy gardens

From the page:
According to the Mammals Trust UK, hedgehog numbers have dropped steeply since 2001 [by over 20%], when a survey to spot animals on roads began.

Experts say that, amongst other factors, tidier decked gardens are responsible for the animals’ decline. Dr Valerie Keeble of the Mammals Trust UK (MTUK) said people should leave their gardens a bit haphazard to encourage the animals’ return.

This ties in with the BUGS Project.