The British Isles were once home not just to red squirrels and hedgehogs, but large mammals such as wolves and lynx. Here are some pages about British mammals, past, present, and perhaps future.
This small 'bit cat' once prowled the woodlands of Britain, right up until the Anglo Saxon period.
The forests when Robin Hood was alive, were home to packs of Wolves. The last wolf of Britain was killed in the 18th century.
When Stonehenge was built, there was Bears hibernating in caves throughout Britain.
If you live in a region where red squirrels continue to exist, here is an article about how you can attract them to your garden, local park or farm.