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.

The delicate, tube-like, violet-blue flowers of Skullcap bloom from June to September in damp places, such as marshes, fens, riverbanks and pond margins.

The whimbrel is very similar to the curlew, but a little smaller and with a striking face pattern. Its eerie call is a series of seven whistles; listen out for it around the coast as its passes…

The dazzling silver-studded blue is a rare butterfly of heathland habitats, mainly in southern England. It has undergone severe population declines in recent years.

Water figwort is a tall plant of riverbanks, pond margins, damp meadows and wet woodlands. Its maroon flowers are pollinated by the Common wasp.

The tree bumblebee is a new arrival to the UK. First recorded here in 2001, it is slowly spreading north. It prefers open woodland and garden habitats and can be found nesting in bird boxes and…

Once widespread, this attractive plant has declined as a result of modern agricultural practices and is now only found in four sites in South East England.

The grey squirrel was introduced into the UK in the 1800s. It provides an easy encounter with wildlife for many people, but can be damaging to woodlands and has contributed to the decline of the…

The linnet can be seen on farmland and heathland across the UK. But, like so many other farmland birds, linnets are declining rapidly, mainly due to agricultural intensification.