The common octopus is a highly intelligent, active predator. It even has a secret weapon - special glands produce a venom that it uses to incapacitate its prey!

This common fungus puffs out clouds of spores when it's mature.

The common rosefinch is a rare visitor to the UK, usually passing through in autumn.

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…

The common squid is a weird and wonderful predator found all around our coasts.

The common polypody is a hardy fern of damp, shady places in woodlands. It also makes a good garden fern. It has ladder-like, leathery foliage with pimply undersides - these spots are the spores…

A member of the buttercup family, Common water-crowfoot displays white, buttercup-like flowers with yellow centres. It can form mats in ponds, ditches and streams during spring and summer.

A large hawker, the common hawker can be seen throughout the summer and into autumn. A fast-flying insect, it catches its prey mid-air. Look for it around ponds in the uplands of the north and…