The nuthatch is a tit-sized, grey and rust-coloured bird that can be easily spotted climbing headfirst down tree trunks in woodlands and parks.

Field elm suffered declines due to the devastating effects of Dutch elm disease, but can still be found across much of the UK.

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

False widow spiders are often the subject of unflattering headlines, but in reality they're unlikely to bite humans.

An attractive, olive-green bird, the greenfinch regularly visits birdtables and feeders in gardens. Look for a bright flash of yellow on its wings as it flies.

A breeding bird of fast-flowing, upland rivers, the grey wagtail can also be seen in lowland areas, farmyards and even towns in winter.

The grey partridge is an attractive bird that prefers the ground to pear trees! Found on farmland and grassland, it is under threat from loss of habitat.

The stately grass-of-parnassus displays pretty, white flowers with green stripes. Once widespread, it is now declining as its wetland habitats are disappearing.

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.

Unlike many of its relatives, this shimmering shieldbug is a predator, feasting on caterpillars and a variety of other insects.