Mae’r malwod môr bach yma i’w canfod ymhlith y gwymon ar lannau creigiog o amgylch llawer o’r DU. Maent yn llawer o wahanol liwiau, o felyn llachar i frown brith!

Often confused with the larger but similarly shaped lion’s mane jellyfish, the blue jellyfish can be colourless when young and develop a striking blue-purple bell as it matures.

This unmistakeable moth, famous for its skull-shaped marking, is a rare visitor to the UK.

Mae’r ystlum hirglust yn driw i’w enw yn sicr: mae ei glustiau bron mor hir â’i gorff! Cadwch lygad amdano’n bwydo ar hyd gwrychoedd, mewn gerddi ac mewn coetiroedd.

Mae'r rhywogaeth yma o siarc main a chain i'w gweld yn aml yn agos at y lan o amgylch ein harfordiroedd a gall dyfu i fod hyd at 6 troedfedd o hyd.

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

Tansy is an aromatic plant of rough grassland, riverbanks and verges that has button-like, yellow flower heads. It is the main foodplant of the rare Tansy Beetle, now found at only two places in…