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Rugops

Rugops was a dinosaur related to Carnotaurus. It lived in what is now Africa, about 95 million years ago. It was a medium-sized carnivorous dinosaur, up to 27 feet long. Rugops lived at the same time Spinosaurus, Carcharodontosaurus, and Deltadro ...

                                               

Russet sparrow

The russet sparrow also called the cinnamon sparrow or cinnamon tree sparrow, is a bird that is part of the sparrow family. It is a small bird with a thick beak, and is 14 to 15 centimetres long. Its feathers are mainly rufous above and grey belo ...

                                               

Ryukyu black-breasted leaf turtle

The Ryukyu black-breasted leaf turtle or Ryukyu leaf turtle, Geoemyda japonica, is a species of turtle in the family Geoemydidae endemic to the Ryukyu Islands in Japan. In 1975, the species was designated a National Natural Monument of Japan. It ...

                                               

Salal

Salal is the common English name of a plant in the family Ericaceae. The Lewis and Clark Expedition found it in North America. The expedition took place from 1804 to 1806. Frederick Traugott Pursh first described it. The official botanical name i ...

                                               

Saliva

Saliva is the watery substance made in the mouths of humans and many animals. Saliva begins digesting food in the mouth, and moistens food to make swallowing easier. Saliva consists of 99.5% water. The mouth is obviously the point of entry to the ...

                                               

Salmonberry

A salmonberry is a type of fruit. It is a bramble in the rose family Rosaceae. It is native and widespread in areas of Alaska, predominantly the southeast. It is also widespread in Washington State. They come in red and orange varieties. They fru ...

                                               

Salvia pratensis

Salvia pratensis is a perennial sage in the family Lamiaceae, that grows in Europe, western Asia and northern Africa. It is a herbaceous perennial plant and grows up to 1.5 m tall. The leaves are arranged in opposite pairs, the leaves on the lowe ...

                                               

Sand cat

The sand cat is a small wild cat in the Felinae subfamily. It is distributed over African and Asian deserts. Sometimes people call it "desert cat," but that is really the name of a different animal. The sand cat does live in deserts, even the Sah ...

                                               

Sand plantain

Sand plantain, It is generally described as an annual forb. It has two seeds, reddish-brown, narrow-elliptic, shining, 2–3 mm long.It is native to Malta and Mediterranean regions, Afghanistan to Pakistan.

                                               

Sandy big-eyed tree frog

The sandy big-eyed tree frog is a tree frog from Papua New Guinea. It lives in the central mountains and Huon Peninsula, between 1100 and 2000 meters above sea level. There are more sandy big-eyed tree frogs in the wild than any other frog in the ...

                                               

Sardine

Sardine is a name of several kinds of fish, especially oily fish. Another name for these fish is Pilchard. All of those fish are quite small and are related to the herring. The Latin name of the family of these fish is Clupeidae. However, the nam ...

                                               

Saurolophus

Saurolophus was a duck-billed dinosaur. It lived during the Upper Cretaceous period, 69.5-68.5 million years ago, toward the end of the Mesozoic Era. Saurolophus had a 5 inch 13 cm long bony spike extending up from its forehead. There is speculat ...

                                               

Saurornithoides

Saurornithoides was a fast running dinosaur from 79 million years ago. It was related to Troodon. Its fossils have been found in Mongolia and China. Like its cousin Troodon, Saurornithoides was an intelligent predator, with large eyes and good vi ...

                                               

Saxifragales

The Saxifragales are a taxonomic order of flowering plants, various dicotyledons. Includes the following families: Family Paeoniaceae peony Family Hamamelidaceae witch-hazel family Family Altingiaceae sweet gum family Family Iteaceae itea or swee ...

                                               

Scalp

It is usually described as having five layers, which can be remembered with the mnemonic "SCALP": C: Connective tissue. a thin layer of fat and fibrous tissue lies beneath the skin P: The pericranium is the periosteum of the skull bones and provi ...

                                               

Scaphopoda

Tusks is the name for the teeth of elephants Scaphopoda, which are called tusk shells in English is a class of marine molluscs. The name of the class can be translated as shovel-footed. These animals vary in size, most are small though. These ani ...

                                               

Scarlet tiger moth

The Scarlet Tiger Moth is a colourful dayflying moth of Europe and the near East. It belongs to the tiger moth family, Arctiidae. The caterpillars feed mostly on comfrey Symphytum officinale. The moth imago flies by day, and has both cryptic colo ...

                                               

Schistosomiasis

Schistosomiasis, also known as snail fever and bilharzia, is a disease caused by parasitic flatworms called schistosomes. The urinary tract or the intestines may be infected. Symptoms include abdominal pain, diarrhea, bloody stool, or blood in th ...

                                               

Schlumbergera

Schlumbergera is a genus of cacti. The genus includes six species, originally found in south-eastern Brazil. These cacti, along with a number of cultivars are common houseplants. They are also known as Christmas Cactus or Thanksgiving Cactus. Thi ...

                                               

Scipionyx

Scipionyx samniticus is one of the most important recent dinosaur finds. It is a tiny theropod fossil found in Cretaceous limestone in southern Italy near Naples. Although it was unearthed thirty years ago in 1981, its true importance was not rea ...

                                               

Scleractinia

Scleractinia, also called stony corals or hard corals, an order in the Cnidaria. It contains the polyps which build most coral reefs. Most of these corals are colonial. They secrete calcium carbonate, the base of every reef. Very often, the coral ...

                                               

Sclerophyll

Sclerophyll is a type of vegetation which has hard leaves and short internodes. The word comes from the Greek sclero and phyllon. Sclerophyllous plants occur in many parts of the world. They are shaped by a Mediterranean climate, with mild, wet w ...

                                               

Scylla serrata

Scylla serrata is a type of crab. It is often called a mud crab or mangrove crab or black crab. It is found in Africa, Australasia and Asia. It lives in estuaries and mangroves.

                                               

Scyphozoa

The Scyphozoa is a class of the phylum Cnidaria, sometimes referred to as the "true jellyfish". There are 200 species. The name Scyphozoa comes from a Greek word which refers to the cup shape of the jellyfish. The medusa form is the dominant life ...

                                               

Sea grass

Sea grasses are flowering plants which live in the sea. They come from one of four plant families in the order Alismatales. They are monocotyledons which grow in marine, fully salineenvironments. Sea grass is a key part of continental shelf ecosy ...

                                               

Secretin

Secretin is a peptide hormone that regulates water balance throughout the body. It is produced in secretory glands of the duodenum. In humans, the secretin peptide is encoded by the SCT gene, which sits on chromosome 11. In 2007, secretin was dis ...

                                               

Selective mutism

Selective mutism is an anxiety disorder where a person normally cannot speak in specific situations, specific places, or to specific people if a certain condition is triggered. Selective mutism usually occurs while the person has a social anxiety ...

                                               

Semi-aquatic

Semi-aquatic animals spend part of their life on land, and part in the water. Such animals include: Some insects, for example dragonflies spend part of their life in the water Whirlygig beetles live on top of the water. Many tetrapods spend exten ...

                                               

Senegal bushbaby

The Senegal bushbaby, also known as the Senegal galago, lesser galago, or lesser bushbaby is a small, nocturnal primate which lives in trees. They prefer dry woodland regions and savannah regions. At the end of the night, group members use a spec ...

                                               

Sensory receptor

A sensory receptor, or sense organ, is the part which responds to a stimulus in the internal or external environment of an organism. It is the input to the sensory system. In response to stimuli the sensory receptor fires off a nerve fibre which ...

                                               

Sepal

Sepals are one of the four basic parts of a flower. They are found below the petals. The sepals are often small and green. Some flowers do not have petals. Then the sepals may be big and colorful. In some flowers, the petals and sepals look the s ...

                                               

Septum

A septum is a partition separating two cavities or spaces. Examples include: Nasal Septum: the cartilage wall separating the nostrils of the human nose.Often deviated or perforated through physical injury or cocaine abuse. The wall dividing the r ...

                                               

Serotonin

Serotonin is a neurotransmitter. Its chemical name is 5-Hydroxytryptamine or 5-HT. It is derived from tryptophan. Serotonin is found in all vertebrates, mainly in the gastrointestinal tract, blood platelets and central nervous system. Its name is ...

                                               

Seven-arm octopus

The seven-arm octopus, also known as the septopus or the heptopus, is claimed to be the largest octopus. The claim is based on a partial specimen, and the estimation is of a 4 metre length and a weight of 75 kg. The North Pacific giant octopus is ...

                                               

Sexology

Sexology is the scientific study of human sexual behavior. This includes things like sexual development, gender identity, and the question of what a normal sexual behavior is. Sexologists also look at questions as to how mentally ill or disabled ...

                                               

Shiba Inu

The Shiba Inu is a breed of dog from Japan. It looks like a smaller version of the Akita Inu, and was first bred for hunting. Shiba Inu is one of seven Japanese dog species recognised as natural symbols of the country. There are two types of Shib ...

                                               

Shih Tzu

The Shih Tzu is a breed of dog weighing 4–7.25 kilograms with long silky hair. The breed originated in China and is among the earliest breeds. Shih Tzu were officially recognized by the American Kennel Club in 1969

                                               

Short-footed frog

The short-footed frog, savannah water-holding frog, blotched water-holding frog, or superb collared frog is a frog from northern Australia. It lives in Queensland. This frog is between 3.0 and 6.0 cm in length. Its feet are not always webbed. It ...

                                               

Shrub

A shrub or bush is a category of plants. A tree usually has one stem, which at some height has branches. A shrub can have multiple stems from the bottom up. Usually, bushes do not grow as tall as trees, very often they are less than 1–2 m tall. V ...

                                               

Sigilmassasaurus

Sigilmassasaurus was a carnivorous theropod dinosaur from the Late Cretaceous of Africa. Its name means Sijilmassa lizard", referring to the name of the city near the place where its fossils were found. Its species name "brevicollis" is Latin for ...

                                               

Signal (biology)

A signal in biology is any kind of coded message sent from one organism to another, or from one place in an organism to another place. Chemical signals Some social behaviours nerve transmission hormones inside organisms Vocal calls between organi ...

                                               

Sika deer

The sika deer is a member of the deer family Cervidae. It lives in East Asia. It is found in mixed deciduous forests to the north, and mixed subtropical deciduous and evergreen forests to the south.

                                               

Silicosis

Silicosis is a disease that is caused by small particles of silica getting trapped in the lungs. When people have silicosis, the changes in their body often are cyanosis, a fever, when the body gets hotter or being not able to breathe properly. S ...

                                               

Silky anteater

The silky anteater, also called the pygmy anteater, is the smallest species of anteater. It is found in southern Mexico and Central/South America. The silky anteater is active at night and lives alone in trees. One of its most noticeable features ...

                                               

Silverfish

Lepisma saccharina is a small, wingless insect. Typically it is between half an inch and one inch. Its common name comes from the animals silvery blue color, combined with the fish-like appearance of its movements. The scientific name indicates t ...

                                               

Siphon (mollusc)

A siphon is a long tube-like structure that is present in certain aquatic molluscs: Gastropods, bivalves, and cephalopods. The tube is used for the exchange of liquids, or air. This flow can have different purposes, the most common are breathing, ...

                                               

Siphonophore

The Siphonophores are an order of cnidarian invertebrates in the class Hydrozoa. The Portuguese man o war is an example. A siphonophore is not a single animal. It is a colony of four kinds of zooids. Zooids are very small, highly modified individ ...

                                               

Sirenia

For information about the Gothic metal band, see Sirenia band Sirenia is an order of herbivorous mammals. In this order are the dugong and three species of manatee.

                                               

Sirenidae

Sirenidae or sirens is a family of aquatic salamanders. They have very small front legs and do not have back legs. They have gills for breathing. Sirens are found only in the southeastern United States and northern Mexico.

                                               

Skate (fish)

For the act of skating, see skating. Skates are cartilaginous fish. They are the family Rajidae in the order Rajiformes. They are chondrichthyes, and closely related to the rays. There are more than 200 species in 27 genera. There are two subfami ...