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Dilophosaurus

Dilophosaurus was a medium-large dinosaur from 190 million years ago. Dilophosaurus has been examined several times over the years and has been put into no less than nine different theropod groups. It may be related to the smaller Coelophysis. Sp ...

                                               

Diogenes syndrome

Diogenes syndrome is a behavioral disorder. It is not a disease, it is a psychological condition. People who have it do not look after themselves enough any more, this is called self-neglect. They do not wash, perhaps do not shave, etc. So they d ...

                                               

Dipodidae

The Dipodidae are a family of small to medium-sized rodents living in the northern hemisphere. The family has over 50 species in 16 genera. They include the jerboas, jumping mice, and birch mice. Different species are found in grassland, deserts, ...

                                               

Dipsacaceae

Dipsacaceae, or teasel family, was a family in the order Dipsacales. It contained 350 species of perennial or biennial herbs and shrubs. The family contained eleven genera. It is in the family Caprifoliaceae now. These plants live in most tempera ...

                                               

Dipsacus fullonum

Fullers Teasel is a species of plant. It is also known as Wild Teasel. It belongs in the teasel family. It is native to Eurasia and Africa, and has been naturalized in the Americas, southern Africa, Australia, and New Zealand. This species grows ...

                                               

Discoglossidae

Discoglossidae is a family of frogs. They are commonly known as the Disc-Tongued Frogs. They live in Europe but some species have been found in Northeastern Africa. An extinct species of the Discoglossidae family used to live in Israel. The famil ...

                                               

Display (zoology)

Display is a form of animal behaviour, linked to survival of the species in various ways. One function of display is in courtship. In most species the male has a striking feature that is distinguished by colour, shape or size, used to attract a f ...

                                               

DNA polymerase

A DNA polymerase is an enzyme which makes DNA molecules from its nucleotide building blocks. DNA polymerases are essential for DNA replication. They usually work in pairs as they copy one double-stranded DNA molecule into two double-stranded DNAs ...

                                               

Dogue de Bordeaux

The Dogue de Bordeaux, Bordeaux Mastiff, French Mastiff is a dog breed that originated in France. The dogs are large, and usually grow to a shoulder height of between 60 centimetres and 70 centimetres. They weight between 120 pounds and 143 pound ...

                                               

Dopamine

Dopamine is a neurotransmitter. Many different kinds of animals and humans use it to transmit information. It is used when the brain sends signals to the muscles in the body to make them move. It can make a person feel good. Dopamine is an import ...

                                               

Dopamine reuptake inhibitor

A dopamine reuptake inhibitor is a drug. Dopamine is a type of brain chemical called a neurotransmitter. Dopamine has many jobs and responsibilities in the brain. Scientists think dopamine controls movement and the human sense of punishment and r ...

                                               

Dorsal

In anatomy, the dorsal is the upper side of animals that can run, fly, or swim in a forwards and backwards direction, and the back side of animals that walk upright. In vertebrates the dorsum contains the backbone. The term dorsal means the parts ...

                                               

Dracophyllum

Dracophyllum is a genus of shrubs or trees in the family Ericaceae. This genus is very close with genus Richea. This plants grow in Australia and Oceania; many species grows in mountains. The number of species is more than 60. The common English ...

                                               

Dracovenator

Dracovenator was a genus of theropod dinosaur that lived in southern Africa during the Lower Jurassic period. That was about 185 million years ago. It is closely related to Dilophosaurus. It might have had a pair of crests like Dilophosaurus. Its ...

                                               

Dracunculus

Dracunculus is a genus of plants in the family Araceae. They have a large purple spathe and spadix, and a foul smell. There are only three species of Dracunculus. Dracunculus vulgaris grows in Southern Europe and Northern Africa. Dracunculus cana ...

                                               

Drentse Patrijshond

The Drentse Patrijshond also Drentsche Patrijshond is a medium sized spaniel-type gun dog from the Netherlands province of Drenthe. Sometimes they are called the "Dutch Partridge Dog" or "Drent" in English.

                                               

Drosera regia

Drosera regia, also known as the King sundew, is a carnivorous plant of the sundew family. In the wild, it only grows in two places in a single valley in South Africa. Its leaves can grow to a size of 70 cm in length. It also has features which a ...

                                               

Drosophila simulans

Drosophila simulans is a species of fruit fly closely related to D. melanogaster It was discovered by the fly geneticist Alfred Sturtevant in 1919, when he noticed that the flies used in Thomas Hunt Morgans laboratory at the Columbia University w ...

                                               

Duct

In anatomy and physiology, a duct is a tube leading from an exocrine gland or organ. It usually carries the glands product to where it is used. An example is the vas deferens, which carries sperm to the ejaculatory ducts. Another example is tear ...

                                               

Dutch rabbit

The Dutch rabbit is also known as Hollander or Brabander. They are little rabbits with distinctive white-blazed faces and two-toned bodies. They are small and compact, making them easy to handle even for children. Dutch have short, glossy fur. Th ...

                                               

Dwarf elephant

Dwarf elephants are prehistoric elephants which lived in the Pleistocene period. They are an example of island dwarfism. Fossil remains of dwarf elephants have been found on the Mediterranean islands of Cyprus, Malta, Crete, Sicily, Sardinia, the ...

                                               

Dysthymia

Dysthymia is a type of mental illness called a mood disorder. People with dysthymia have depression that is mild to moderate and lasts for years. Dysthymia is a chronic long-lasting condition. A person must have symptoms for at least two years to ...

                                               

Eagle

Eagles are large birds of prey which live in and are mostly found in Eurasia and in Africa, but also in many parts of the world. Eagles hunt during the day and have very good eyesight. The golden eagle is found over most of the world and it usual ...

                                               

Ear

The ear is the part of the body which allows animals to hear. People and most mammals have ears. Non-mammals can also hear, but may have holes instead of external ears. The ear works by directing sound to the inner ear. These vibrations are sent ...

                                               

Earless seal

Family Phocidae Mediterranean Monk Seal monachus Genus Monachus Tribe Monachini Caribbean Monk Seal Monachus tropicalis † Subfamily Monachinae Hawaiian Monk Seal Monachus schauinslandi Southern Elephant Seal Mirounga leonina Genus Mirounga: Eleph ...

                                               

Earwig

Earwigs is the name given to a group of insects. They are characterized by wings they can fold under short, leather-like forewings. There are about 1800 species of earwigs. They do not seem to spread any disease, or harm humans in any way. Most o ...

                                               

Eastern cottontail

The Eastern cottontail is a New World cottontail rabbit, a member of the family Leporidae. It is the most common rabbit species in North America.

                                               

Eastern dwarf tree frog

The eastern dwarf tree frog is a frog from Australia. It lives in Queensland and New South Wales. This frog is 2.5 cm long. It is either bright green or bronze with green marks. There is a bronze stripe from its nose down its body. It has a white ...

                                               

Eastern green mamba

The eastern green mamba is a highly venomous snake species of the mamba genus Dendroaspis. They are found in the coastal regions of southern East Africa. It was discovered in 1849. It has a slender build with bright green upperparts and yellow-gr ...

                                               

Eastern hognose snake

The average length for an adult eastern hognose snake is 71 cm 28 in length. The most amazing feature is the upturned nose. It is used for digging in sandy soils. It can be red, green, orange, brown or gray to black depending on where it comes fr ...

                                               

Eastern mosquitofish

The eastern mosquitofish, eastern gambusia, or mosquito fish is a fish that belongs to the Poeciliidae family. It is from the eastern United States but human beings brought it to many other parts of the world, such as Hawaii, Puerto Rico, and Aus ...

                                               

Eastern red bat

The eastern red bat is a type of microbat in the family Vespertilionidae. Eastern red bats are found across eastern North America. It has also been seen in Bermuda.

                                               

Eastern water-holding frog

The eastern water-holding frog, flat-headed frog, common water-holding frog or water-holding frog is a frog from Australia. It lives in the dry middle of the country in Queensland, Victoria, South Australia and New South Wales. The adult frog is ...

                                               

Ebenaceae

The Ebenaceae are a family of flowering plants, which includes ebony and persimmon. The family has approximately 500 species of trees and shrubs in two genera, Diospyros and Euclea. The species are mostly evergreen and native to the tropics and s ...

                                               

Ecdysozoa

The Ecdysozoa are a group of protostome animal phyla. This is a taxon above the level of phylum. It includes the Arthropoda, Nematoda, and several smaller phyla. They were first defined in 1997, based mainly on phylogenetic trees taken from 18S r ...

                                               

Eczema

Eczema is a form of dermatitis, or inflammation of the epidermis. The epidermis is the outer layer of the skin. Eczema is a skin disease that makes your skin dry with a red or pink color to it. It becomes irritated very easily. The persons skin m ...

                                               

Egyptian plover

The Egyptian plover is a wader. It is the only member of the genus Pluvianus. It is sometimes called the crocodile bird. This is because of a story dating to Herodotus. In the story the crocodiles lie on the shore with their mouths open. The plov ...

                                               

Elasmobranchii

Fossilised shark teeth are known from the early Devonian, around 400 million years ago. During the following Carboniferous period, the sharks underwent a period of diversification, with many new forms evolving. Many of these became extinct during ...

                                               

Elephant seal

The Elephant Seal is a huge seal of the genus Mirounga. There are two species, one in each hemisphere. The southern elephant seal, is found in Antarctic waters, while the northern elephant seal lives on islands of California and Mexico. The eleph ...

                                               

Elephant shrew

The elephant shrew, also called sengi, are any of 16 species of rat-sized African mammals named for their long, tapered, and flexible snout. All have slim bodies, slender limbs, and very long hind legs and feet. Although they resemble shrews, the ...

                                               

Embryo

An embryo is the earliest stage in the development of a fertilised egg. It is the term used for any animal or plant, from the first cell division until birth, or hatching, or germination in plants. In humans, it is called an embryo until about ei ...

                                               

Embryology

Embryology is the study of embryos and their development. The study of embryology starts with the fertilisation of an egg, and continues until the foetus stage. A broader term, developmental biology, covers the whole period of growth from the egg ...

                                               

Encephalitis

Encephalitis is sudden inflammation in the brain. It is usually caused by viruses, bacteria, or other pathogens. As the brain swells, it can get damaged when it gets crushed against the skull. Encephalitis can cause serious symptoms, like seizure ...

                                               

Endangered species

An endangered species is a species of animals, plants or other organisms that is in danger of becoming extinct. This could happen because there are few of that animal left, its predators have grown in number, or the climate that it lives in is ch ...

                                               

Endopterygota

The Endopterygota, are insects of the subclass Pterygota. They have complete metamorphosis. This means they go through different larval, pupal, and adult stages. The larval and adult stages differ very much in their anatomy and behavior. This is ...

                                               

Endospore

An endospore is a structure made by bacteria for survival purposes. Bacteria turn to endosporea when they undergo stress, such as an increase in heat or lack of nutrients. This process is known as sporulation. Endospores are small, rounded, resti ...

                                               

Enkephalin

An enkephalin is one of the first endorphins that were discovered in the brain. They are found in many parts of the brain, specially in the basal ganglia. They act as "natural pain killers". Enkephalins are small proteins. They consist of five am ...

                                               

Ensifera

Ensifera is a suborder of the order Orthoptera. It includes the insects commonly known as crickets, katydids and bush crickets. "Ensifer" means "sword bearer" in Latin, and refers to the long and blade-like ovipositor of the females.

                                               

Entomology

Entomology is the science of insects. People who study insects are called entomologists. Insects have been studied since prehistoric times, but it was not until as early as the 16th century that insects were scientifically studied. Some entomolog ...

                                               

Eosinophil granulocyte

Eosinophil granulocytes, usually called eosinophils or eosinophiles, are granulocyte white blood cells that fight off certain parasites and infections in vertebrates. When they are activated, eosinophils release a cocktail of proteins from their ...