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 muntjac deer was introduced into the UK from China in the 20th century. It has gained a stronghold in southeast England, where it can cause damage to our woods through browsing.

This purply-brown seaweed is a common feature on our rocky shores and on our dinner plates.

The herring gull is the typical 'seagull' of our seaside resorts, though our coastal populations have declined in recent decades.

Sand eels are a hugely important part of our marine ecosystem. In fact, the fledgling success of our breeding seabirds entirely depends on them.