Although they might not look it, sea cucumbers like this one belong to the Echinoderm group and are therefore closely related to starfish and sea urchins

An attractive, olive-green bird, the greenfinch regularly visits birdtables and feeders in gardens. Look for a bright flash of yellow on its wings as it flies.

Look for the round, cottony, purple flower heads of the Woolly thistle on chalk and limestone grasslands in summer. It is mainly found in Southern England.

Living up to its name, the bullhead has a characteristically large, flattened head and a tapering body. Look out for it in fast-flowing, stony rivers and streams.

Look for the small, white, star-shaped flowers of Common chickweed all year-round. Sometimes considered a 'weed', it is still a valuable food source for insects.

Look out for the Daubenton's bat foraging over wetlands across the UK at twilight. Its flight is fast and agile as it skims the water's surface for insect-prey.

Frogbit looks like a mini water-lily as it floats on the surface of ponds, lakes and still waterways. It offers shelter to tadpoles, fish and dragonfly larve.

The Marsh helleborine is a beautiful orchid of fens, wet grassland and dune slacks. Growing in profusion in places, look for reddish stems and white-and-pink flowers.

As its name suggests, Meadowsweet is a sweet-smelling flower of damp meadows, ditches and riverbanks. Look for frothy clusters of cream flowers on tall stems.

The sea hare looks like a sea slug – but in fact has an internal shell. They can be up to 20cm long but are usually much shorter.