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Hedgehogs declined due to the application of insecticides in vast quantities. The remaining starving population is vulnerable to predation by badgers who are similarly finding food hard to find at certain times of the year for the same reason.
Providing lots of insect rich habitat will help but it’s probably a losing battle.
Hares of course need a very different environment. Are there any nearby?
Only problem is our viszlas now spend all day digging for rodents, their front claws are nearly worn out and they get mud jammed into their paws. But we really wanted to encourage more raptors so it has been a success. The next animals we’d like to facilitate are hedgehogs and hares. But the large badger sets may be why we don’t have many hedgehogs.