Mae'r siarc main yma’n cael ei enw o'r pigau o flaen ei asgell ddorsal. Gall ddefnyddio'r pigau yma i amddiffyn ei hun drwy gyrlio mewn bwa a tharo ysglyfaethwr.

The large, fluffy caterpillars of this moth are often seen in summer and early spring.

This distinctive bug is often seen basking on low-growing plants in spring and summer.

The porbeagle shark is a member of the shark family Lamnidae, making it one of the closest living relatives of the great white shark.

Bilberries appear in summer and early autumn and are often turned into jams, pies and sauces...

This bog-loving butterfly is mostly found in the north of the UK, where it takes to the wing in summer.

This is a predominantly subtidal species but can be found on the lowest parts of a sheltered rocky shore in summer.

This metallic green beetle can be seen visiting flowers on sunny days in spring and summer.