Native oysters are a staple of our seas and our plates - but our love of their taste has lead to a sharp decline all around the UK.

This brightly coloured and easily recognizable fish is one of three gurnard species found in UK seas. Collectively, gurnards are known as sea robins.

In summer, the sedge warbler can be spotted singing from a reed or willow perch in wetlands across the UK. Males never sing the same song twice, adding new phrases to impress the females.

The Speckled bush-cricket, as its name suggests, is covered in tiny, black speckles. It can be found in scrub, hedgerows and gardens throughout summer. Males rub their wings together to create a…

The lesser stag beetle may be smaller than its famous cousin, but it is still a large beetle with large jaws. It can be seen in woods, parks and hedgerows during summer, and depends on dead wood…

Shag' is a very old name that means 'tufted' and refers to the small crest that this bird sports. Look out for it in spring and summer either diving for fish from the surface of the…

Musk mallow has pretty pink flowers that can be seen along roadside verges, hedgerows and field margins in summer. It lives up to its name, producing a delicate, musky smell that increases indoors…

This gentle giant is the largest shark in UK seas, reaching up to 12m in length. There's no need to fear them though, they only eat plankton!

The moon jelly is the most common jellyfish in UK seas, often washing up on our beaches. No need to worry though - it doesn't sting humans.

This little fish is found in rockpools during the summer months and has a clever adaptation that stops it being swept away by strong waves - their pelvic fins are fused to form a sucker that it…