Ruby-tailed wasp
If seen up close, the glittering Ruby-tailed wasp is, perhaps, one of the UK's most beautiful insects. A solitary wasp, it can be found in sandy and rocky habitats like quarries, outcrops and walls.
Ruff
The UK hosts a small, but important, breeding population of ruff. The ruff is a large sandpiper that is so-called due to the large ruff of feathers around the males' neck. This is used in a showy display to attract a mate.
Salad burnet
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!
Sand eel
Sand eels are a hugely important part of our marine ecosystem. In fact, the fledgling success of our breeding seabirds entirely depends on them.
Sand hopper
Sand Hoppers really live up to their name, jumping high into the air when disturbed.
Sand lizard
The sand lizard is extremely rare due to the loss of its sandy heath and dune habitats. Reintroduction programmes have helped establish new populations.
Sand martin
The tiny, brown-and-white sand martin is a common summer visitor to the UK, nesting in colonies on rivers, lakes and flooded gravel pits. It returns to Africa in winter.
Sand mason worm
This worm builds its own home out of bits of shell and sand. It can be spotted on the shore all around the UK.
Sand sedge
Sand sedge is an important feature of our coastal sand dunes, helping to stabilise the dunes, which allows them to grow up and become colonised by other species.
Sanderling
The sanderling scampers about the waves looking for marine crustaceans, fish and even jellyfish to eat. It visits the UK in winter from its Arctic breeding grounds, but can also be seen as it passes through on migration during spring and autumn.
Sandwich tern
Found around our coasts during the breeding season, the large Sandwich tern can be spotted diving into the sea for fish such as sandeels. It nests in colonies on sand and shingle beaches, and islands.
Saucer bug
An underwater predator, the Saucer bug uses its front pincer-like legs to catch its prey. It can be found at the bottom of muddy, weedy ponds; but handle with care - it can inflict a painful bite!