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.

Giants of the jellyfish world, these incredible creatures are the UK’s largest jellyfish! They can grow to the size of dustbin lids – giving them their other common name: dustbin-lid jellyfish.…

The pretty Deptford pink is a very rare flower that is very vulnerable to the loss of our traditional grassland and farmland habitats. It can only be found in a few places in England and Wales.…

A great way to get up close and personal with the magnificent osprey is via one of the many nestcams set-up in the places that it breeds: Scotland, Cumbria, Wales and the East Midlands.

With a silvery body, and purple, pink and bluish streaks down its flanks, the rainbow trout lives up to its name. Popular with anglers, it is actually an introduced species in the UK.

A handsome fish, the tench has olive-green flanks, powerful fins and distinctive red eyes. It can be found in lowland lakes and slow-flowing rivers around the UK.

The common polypody is a hardy fern of damp, shady places in woodlands. It also makes a good garden fern. It has ladder-like, leathery foliage with pimply undersides - these spots are the spores…

Field wood-rush is a short rush that forms tufts in grassy places, such as lawns, parks and downlands. A defining characteristic is its leaf-like leaves that are fringed with long, white hairs.…