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.

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.

Large scale drainage in the UK has seen a massive reduction in the range of this sensitive aquatic plant which now only occurs in around 50 sites in England.

Bladder campion is so-called for the bladder-like bulge that sites just behind the five-petalled flower - this is actually the fused sepals. Look for it on grasslands, farmland and along hedgerows…

This beautiful butterfly is one of our rarest, now mostly restricted to the western parts of the UK.

The rare heath fritillary was on the brink of extinction in the 1970s, but conservation action turned its fortunes around. It is still confined to a small number of sites in the south of England,…

Unsurprisingly, the chalkhill blue can be found on sunny, chalk grassland sites in southern England. Clouds of this beautiful blue butterfly may be seen fluttering around low-growing flowers.