Rocky habitats are some of the most natural and untouched places in the UK. Often high up in the hills and hard to reach, they are havens for some of our rarest wildlife.

These grasslands, occupying much of the UK's heavily-grazed upland landscape, are of greater cultural than wildlife interest, but remain a habitat to some scarce and declining species.

From otters to freshwater shrimps, all animals are dependant on an abundant and reliable supply of clean water. Rivers sustain the natural environment, wildlife and people in equal measure.

Saltwater marshes and mudflats form as saltwater floods swiftly and silently up winding creeks to cover the marsh before retreating again. This process reveals glistening mud teeming with the…