Er ei fod braidd yn swil, mae’r mamal morol rhyfeddol yma i’w weld yn agos at y lan mewn dyfroedd bas. Os byddwch chi’n llwyddo i fynd yn agos ato, cofiwch wrando am y sŵn ‘pwffian’ uchel mae’n ei…

A spindly tree of heathland and moorlands, and dry and sandy soils, the Silver birch is well known for its paper-thin, white bark. It is a great coloniser and can quickly spread in an area.

A spindly tree of heathland and moorlands, and damp soils, the Downy birch is well known for its paper-thin, white bark. It is so-called for the hairy stalks from which its leaves grow; the Silver…

The jackdaw is a small, black-capped crow of woodlands, parks, towns and coast. It is a well-known thief, stealing other birds' eggs and breaking into garden feeders.

A low-growing herb of chalk and limestone grassland, Salad burnet lives up to its name - it is a popular addition to salads and smells of cucumber when crushed!

A classic fern of woodlands across the UK, the male-fern is also a great addition to any garden. It grows impressive stands from underground rhizomes, dying back in autumn.

Water-cress has become so popular as a salad addition that it is now cultivated on a wide scale. In the wild, it grows in shallow, fast-flowing streams and is an indicator of clean water.

This brown seaweed lives in the mid shore and looks a bit like bubble wrap with the distinctive air bladders that give it its name.

Caddisflies are a large order of insects that can be found in all kinds of wetlands. The larvae are known for making cases to pupate in, gathering stones, sand and leaves, and wrapping them with…