The vast, green mats that sometimes cover the surface of still water, such as ponds, flooded gravel pits and old canals, are actually Common duckweed. A tiny, single plant, it groups together to…

Despite its dazzling colouration, this fabulous nudibranch can be easily missed, due to its small size!

This large shrike visits the UK in small numbers each year, passing through on migration or spending the winter here.

This small finch nests on moorlands and coastal crofts, spending the winter on the coast. The UK population has declined dramatically.

The brown hairstreak is an elusive butterfly that spends much of its time in the treetops feeding on aphid honeydew.

This small duck is an uncommon winter visitor to the UK, where they're usually found on lakes, reservoirs and gravel pits.

Look for the small, pink, pea-shaped flowers of Common restharrow on chalk and limestone grasslands, and in coastal areas, during summer.

Enchanter's nightshade is a hairy plant, with rounded leaves that taper to a fine tip, and clusters of small, pinky-white flowers in summer.