Make a wildlife-friendly compost for woodlice, worms, toads, grass snakes as well as soil invertebrates and fungi, which in turn attracts birds and mammals.
Leaving a some grass to grow long in your garden provides habitat and food for many 'bugs', which become food for birds and hedgehogs. Many butterfly caterpillars rely on long grass eg Meadow brown and Marbled white
Mowing your lawn less saves you time and makes a big difference to wildlife. Even setting your mower to a higher cut allows wildflowers to grow providing food for pollinators.
One of the main reasons why hedgehogs are declining is because our fences and walls are becoming more and more secure, reducing the amount of land available to them