Europe's largest frog is not naturally found in the UK, but was introduced to Kent and has spread throughout the southeast.

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 common fungus puffs out clouds of spores when it's mature.

The garden tiger is an attractive, brown-and-white moth of sand dunes, woodland edges, meadows and hedgerows; it will also visit gardens. In decline, it is suffering from the 'tidying up…