Mae'r gragen las yn olygfa gyfarwydd ar draethau ledled y DU ac mae'n hoff fwyd gan bobl, adar môr a sêr môr fel ei gilydd.

This stocky wader is mostly a winter visitor to the UK, where it can be found on rocky, seaweed-covered coasts, often with groups of turnstones.

Ydych chi wedi gweld y twmpathau tebyg i bryfed genwair yma erioed ar draethau? Arwyddion o lyngyr y traeth yw’r rhain! Nid yw’r llyngyr eu hunain i’w gweld byth bron, ac eithrio gan bysgotwyr sy’…

Although introduced by humans, the fallow deer has been here so long that it is considered naturalised. Look out for groups of white-spotted deer in woodland glades.

The Migrant hawker is not a particularly aggressive species, and may be seen feeding in large groups. It flies late into autumn and can be seen in gardens, grasslands and woodlands.

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

The Notch-horned cleg-fly isa horse fly dark grey in colour, with grey-brown mottled wings and intricately striped, iridescent eyes. There are 30 species of horse-fly in the UK; this is one of the…

The common octopus is a highly intelligent, active predator. It even has a secret weapon - special glands produce a venom that it uses to incapacitate its prey!