The Common walnut tree produces a large, brown nut that is familiar to so many of us. It is an introduced species in the UK, and can be seen in towns, gardens and parks.

Tawny owls are the familiar brown owls of Britain’s woodlands, parks and gardens. They are known for their ‘too-wit too-woo’ song that can be heard at night-time.

The stiff, spiky and upright leaves and brown flowers of hard rush are a familiar sight of wetlands, riversides, dune slacks and marshes across England and Wales.

The small heath is the smallest of our brown butterflies and has a fluttering flight. It favours heathlands, as its name suggests, as well as other sunny habitats.

Brush through a wildflower meadow at the height of summer and you'll hear the tiny seeds of yellow-rattle rattling in their brown pods, hence its name.

The rare Adonis blue can be spotted on sunny chalk grasslands throughout summer. Males are a dazzling sky-blue in colour, while females are duller brown.

The house sparrow is a familiar, streaky brown bird of towns, parks and gardens. Males sport a grey cap and black bib, the size of which indicates their status.

Mae’n hawdd gweld o ble mae’r slefren fôr cwmpawd wedi cael ei henw – mae ei marciau brown yn edrych yn union fel cwmpawd! Er ei bod yn edrych yn hardd – mae ei brath yn gas, felly cadwch eich…