Introduced from Japan in the 19th century, Japanese knotweed is now an invasive non-native plant of many riverbanks, waste grounds and roadside verges, where it prevents native species from…

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.

These non-native limpets arrived from America in the 19th century and are now widespread in the UK. They form stacks and have a specially adapted shell which, when flipped upside down, looks like…

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.

Goose barnacles often wash up on our shores attached to flotsam after big storms.

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…