Mae’r aderyn bach dirgel yma’n adnabyddus am ei gri iasol ac ar un adeg, cafodd ei gamgymryd am wrachod gan fôr-ladron oddi ar arfordir Cymru! Mae’n teithio miloedd o filltiroedd bob blwyddyn i…

The Arctic tern is famed for its aggression towards any that would disturb its nest - it will dive-bomb intruders with its sharp beak. Large, noisy colonies can be found on the Farne Islands and…

A scarce but distinctive brown seaweed with curved, funnel-shaped fronds. It is a warmer water species at the northern edge of its range on the south coast of England.

The Leisler's bat flies fast and high near the treetops, but you might also spot it flying around lamp posts, looking for insects attracted to the light.

The blackbird of the mountains, ring ouzels can be found breeding on upland moors and rocky crags in summer.

A delicate, small plant of woodlands and hedgerows, wood-sorrel has distinctive, trefoil leaves and white flowers with purple veins; both fold up at night.

As the only crow with a red bill and red legs, the all-black chough is easy to identify. But it's harder to spot: there are only small, coastal populations in Scotland, Ireland, Wales,…