Conservation statuses: Least concern

As the name suggests, the Common medium stonefly is found in gravelly upland rivers and streams, often on bankside stones and plants. There are 34 species of Stonefly in the UK, which are hard to tell apart.

Also known as the 'green drake mayfly', the common mayfly can be found around unpolluted wetlands, such as lakes and rivers. It has transparent, lacy wings and three long 'tails'.

The wolf spider can be found in a wide range of habitats, including the garden. It hunts down its prey, leaping on it just like a wolf. Spiders are beneficial neighbours, helping to manage garden pests.

There are several species of spider that live in our wetlands, but the water spider is the only one that spends its life under the water. In its pond habitats, it looks silvery because of the air bubbles it traps in its hairs.

The giant house spider is one of our fastest invertebrates, running up to half a metre per second. This large, brown spider spins sheet-like cobwebs and pops up in the dark corners of houses, particularly in autumn.

The wasp spider is a great mimic - looking just like a common wasp keeps it safe from predators, even though it is not dangerous itself. It can be found in southern England, but is spreading north.

• Species
• Spiders

Have you ever stopped to look at the shape of a spider web? Garden spiders spin a spiral shaped web, perfect for catching lots of juicy prey!

The defensive mechanism of the pill woodlouse is very recognisable - it curls itself into a tight ball, only showing its plated armour to its attacker. It is an important recycler of nutrients, feeding on decaying matter.

Found in compost heaps and under stones in gardens, the Flat-backed millipede is a common minibeast. Despite its name, it only has about 40 legs. It is an important recycler of nutrients, feeding on decaying matter.

When threatened, the Green tortoise beetle acts just like a tortoise, pulling its feet and antennae in and hunkering down, gripping the leaf it is on as tightly as possible. Look for it on White Dead-nettle in gardens and hedgerows.