Mae gwenyn meirch yn gyfarwydd iawn ond er hynny, dydyn nhw ddim yn boblogaidd iawn! Ond rhowch siawns i’r ffrindiau du a melyn yma, oherwydd maen nhw’n beillwyr pwysig a hefyd yn dda iawn am…

This dazzling moss grows in dark places, catching any faint light to glow a golden-green.

Mae’r ysgwydd felen yn ffwng ysgwydd lliw melyn sylffwr ar goed mewn coedwigoedd, parciau a gerddi. Mae i'w ganfod yn aml mewn clystyrau haenog ar dderw, ond mae hefyd yn hoffi ffawydd,…

This grass-green seaweed is sometimes known as Grass Kelp and grows on pretty much every shore in the UK.

Mae’n hawdd drysu’r gwyfynod du a choch hardd yma am löynnod byw yn aml! Mae eu lindys du a melyn yn olygfa gyffredin ar blanhigion llysiau’r gingroen. Mae lliwiau llachar y lindys yn rhybuddio…

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.

Like many of our farmland birds, the corn bunting has declined in number in recent years. Spot this streaky brown, thick-billed bird singing from a wire or post - it sounds just like a set of…

An uncommon hedgerow and woodland tree of central and eastern England, Purging buckthorn displays yellow-green flowers in spring, and poisonous, black berries in autumn.

A large colourful sea slug found on rocky shores around the UK.

An easily overlooked orchid, the Common twayblade is yellow-green and less showy than other UK orchids. Look for it in woodlands and grasslands on chalky soils, in particular.

As its name suggests, Sea spurge is found at the coast. It is an attractive plant that displays cup-shaped, greeny-yellow flowers and fleshy, grey-green leaves.