Fireworks anemone
This rare anemone lives up to its name with a spectacular display of long, white tentacles.
Flat periwinkle
These little sea snails are found amongst the seaweed on rocky shores around much of the UK. They come in lots of different colours, from bright yellow to chequered brown!
Flat-backed millipede
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.
Flower crab spider
The flower crab spider is one of 27 species of crab spider. The flower crab spider can alter the colour of its body to match its surroundings and to hide from prey. It is not as common as other types of crab spider.
Flowering rush
Flowering rush is a pretty rush-like plant of shallow wetland habitats, such as ponds, canals and ditches. Its cup-shaped, pink flowers appear in summer, brightening up the water's edge.
Fly agaric
The classic fairy tale toadstool, this red and white fungus is often found beneath birch trees in autumn.
Fly orchid
The fly-shaped flowers of this fascinating plant are attractive to insects - but not the ones you might expect!
Forest bug
The shoulders of the Forest bug are distinctive - they are square-cut, almost rounded, unlike the other 'spiked' shield bugs. This bug can be found in woodlands, feeding on the sap of oak trees.
Four-spotted chaser
The Four-spotted chaser is easily recognised by the two dark spots on the leading edge of each wing - giving this species its name. It can be seen on heathlands and near ponds and lakes.
Fox moth
The large, fluffy caterpillars of this moth are often seen in summer and early spring.
Foxglove
The Foxglove is a familiar, tall plant, with pink flower spikes and a deadly nature. In summer, it can be spotted in woodlands and gardens, and on moorlands, roadside verges and waste grounds.
Frog orchid
This unassuming orchid is easily overlooked. It is found patchily across the UK, but has been declining for decades.