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Muroidea

Muroidea is a large superfamily of rodents. It includes hamsters, gerbils, true mice and rats, and many other relatives. They live on almost every continent except Antarctica. Some scientists have placed all members of this group into a single fa ...

                                               

Muskrat

Muskrats are rodents that live in freshwater and saltwater marshes, lakes, ponds, and streams. Muskrats often build dome-shaped houses in marshes. These houses, made of plants, protect the muskrat from predators, since the only entrance is underw ...

                                               

Mute swan

The mute swan is a species of swan, and thus a member of the duck, goose and swan family Anatidae. It is native to much of Europe and Asia, and the far north of Africa. It is also an introduced species in North America, Australasia and southern A ...

                                               

Myasthenia gravis

Myasthenia gravis is a rare autoimmune disease. It causes weak muscles and tiredness. Stress and hot weather can make the symptoms worse. It also gets worse with activity. Myasthenia gravis is caused by your immune system attacking the nerves tha ...

                                               

Myelodysplastic syndrome

The Myelodysplastic syndrome is a group of diseases and conditions that affect how blood is made. These diseases were formerly known as preleukemia, mostly because sometimes they can lead to leukemia. Often, its name is shortened to MDS. Myelodys ...

                                               

Myomorpha

Suborder Myomorpha has 1.137 species of mouse-like rodents, almost a quarter of all mammals. mice, rats, gerbils, hamsters, lemmings and voles are in the group. They are grouped according to how the jaw looks like and how the molar teeth look lik ...

                                               

Myopia

Myopia, also called near-sightedness or short-sightedness, is a problem with the focusing ability of the eye. It is when the eye is not able to focus properly on objects in the distance. This condition is very common and it often occurs with many ...

                                               

Myrmecophile

A myrmecophile is an animal that lives with ants. A myrmecophile may help the ants, or it may be a parasite of the ants by eating them or their food. Many myrmecophiles eat waste in ant nests, such as dead ants or fungi growing in the nest. Some ...

                                               

Myrtaceae

The Myrtaceae or Myrtle family are a family of dicotyledon plants, placed within the order Myrtales. Myrtle, clove, guava, feijoa, allspice, and Eucalyptus belong here. All species are woody, with essential oils, and flower parts in multiples of ...

                                               

Mytilus coruscus

Mytilus coruscus is the scientific name for the Korean mussel. It is also called the hard-shelled mussel. It is a species of mussel and a marine bivalve mollusc. It is in the family Mytilidae. This species is heavily used as a food item via maric ...

                                               

Nail (anatomy)

A nail is a hard part of the body at the tip of the fingers and toes, of which most people have ten. Toenails and fingernails are similar, except that toenails grow four times more slowly. Only certain mammals have nails: mostly, they are found i ...

                                               

Namtap

The namtap or spectacled dormouse is a species of rodent in the Gliridae family, and one of the four Dormouse species which are endemic to South Africa. The namtap has a bushy tale like a squirrel, a fairly short muzzle the part of the Dormouses ...

                                               

Nanosaurus

Nanosaurus was an ornithopod dinosaur that measured about 4 ft long, weighing about 50 pounds. Othnielia had a horny beak and a small skull with self-sharpening cheek teeth. Othnielia may have had cheek pouches. This plant eater was bipedal walke ...

                                               

Narcissus (genus)

Narcissus is the botanic name for a genus of mainly hardy, mostly spring-flowering, bulbs in the Amaryllidaceae family. They are native to Europe, North Africa, and Asia.

                                               

Narrow fringed frog

The leaf green tree frog, leaf green river tree frog or narrow fringed tree frog is a frog from Victoria and New South Wales. It lives on the flat lands not far from the ocean. This frog is 2.5 to 4.0 cm long. It is bright green, dark green or br ...

                                               

Nasal septum

The fleshy external end of the nasal septum is sometimes also called columella. The nasal septum is composed of three structures: vomer bone ethmoid bone quadrangular cartilage

                                               

Natural killer T cell

Natural killer T cells are cells formed from small lymphocytes. They are a type of T cell, and are different from natural killer cells. NKT cells are important, but make up only 0.1% of all peripheral blood T cells. NKT cells are a subset of T ce ...

                                               

Negev tortoise

The Negev tortoise is a tortoise found mainly in the Negev desert in southern Israel. It was once present in the Sinai Peninsula. In Israel it is protected by law and there are conservation programs. It is currently considered a critically endang ...

                                               

Nelumbo indica

Nelumbo Indica, or Nelumbo speciosa, also known as Indus Valley lotus, Sindhu lotus, Sindhi lotus, Bean of Pakistan, Pakistani bean or simply Asiatic white lotus, is one of two extant Asian species of aquatic plant in the family Nelumbonaceae. Is ...

                                               

Nematocera

The Nematocera are a large suborder of flies which include the mosquitoes and midges. They usually have long thin bodies, with segmented antennae. Usually their larvae are aquatic, but there are many exceptions to this. Examples of the Nematocera ...

                                               

Nematode

The nematodes or roundworms are one of the most diverse of all animal phyla. They are one of the protostome phyla. Nematode species look very similar to one another. Over 80.000 have been described, of which over 15.000 are parasitic. It has been ...

                                               

Nēnē

The Nēnē, or Hawaiian goose is a species of goose. It is found today on only three Hawaiian islands. It gets its name from its soft call. This is an unmistakable species, with its generally brown plumage feathers and darker head. Its strong toes ...

                                               

Neognathae

Neognathae are birds in the subclass Neornithes. The Neognathae include almost all living birds: their sister taxon Palaeognathae has just the tinamou and the flightless ratites. There are nearly 10.000 species of neognaths. Since the Cretaceous ...

                                               

Neonatal diabetes mellitus

Neonatal diabetes mellitus is a type of diabetes. It happens during the first 6 months of human life. Infants with this condition do not produce enough insulin. This causes an increase of blood sugar. NDM is often mistaken for the much more commo ...

                                               

Neopilina

Neopilina is a mollusc, the only surviving genus of monoplacophora. Some molecular results show that they fall within the polyplacophora clade, although these have been called into question. Fossil and morphological data show that they are rather ...

                                               

Nepenthes

The Nepenthes, often known as Tropical Pitcher Plants or Monkey Cups, are a genus of carnivorous plants in the family of the Nepenthaceae consisting of about 120 species. Many hybrids exist, both natural and created by humans. These plants come f ...

                                               

Nerve plexus

A nerve plexus is a branching network of nerves which serves a part of the body. Nerves which go to and from the central nervous system bunch up in certain places. Between each vertebra is a plexus of nerves going in and coming out of the spinal ...

                                               

Nervous system

The nervous system is a body system which sends signals around the body. It lets animals respond to what is around them. The central nervous system is the brain, the spinal cord, and nerves. It is present in almost all animals. It is there to pro ...

                                               

Neuroblastoma

Neuroblastoma is a kind of cancer that usually occurs in children and infants. This kind of cancer mostly affects the Autonomic nervous system. The cancer creates tumors, but the cells or pieces of the tumors do not fully finish growing. There ar ...

                                               

Neurodiversity

Neurodiversity is a word for differences in peoples brains. It is a type of biodiversity. Examples of neurodiverse conditions include autism, Tourette syndrome, ADHD, and dyslexia.

                                               

Neutrophil

Neutrophils are the most common type of white blood cell, often called neutrophil granulocytes. They destroy bacteria during an infection. They get to the site of an injury within minutes. They have tiny granules full of enzymes and peptides whic ...

                                               

New England tree frog

The New England tree frog, gold-striped tree frog, sublime tree frog or glandular tree frog is a tree frog from Australia. Even though it is called the New England tree frog, it does not live in New England. It lives on Australias New England Tab ...

                                               

New Guinea crocodile

The New Guinea crocodile is a type of crocodile. It lives on the island of New Guinea. The habitat of the New Guinea crocodile is mostly freshwater swamps and lakes. It is very active at night when it feeds on fish and other small animals.

                                               

New World monkey

New World monkeys are the families of primates which are found in Central and South America. The families are ranked together as the Ceboidea superfamily, the only living platyrrhine superfamily. They differ from the Old World monkeys and apes, w ...

                                               

New World rats and mice

The New World rats and mice are a group of rodents from the family Cricetidae. They are mammals with fur and long tails. These animals live in the wild in North and South America. The group is very large, with about 500 different species. Biologi ...

                                               

New World vulture

New World vultures are the group of vultures that are found in the Americas. They form the family Cathartidae. There are seven species in five genera. Four of the genera contain only one species each, so they are monotypic. These are large birds ...

                                               

Nicaragua cross-banded tree frog

The Nicaragua cross-banded tree frog or tawny smilisca is a frog that lives in Costa Rica and Nicaragua. Scientists have seen it as high as 520 meters above sea level. The adult male frog is 3.2 to 3.8 cm long and the adult female frog is 4.0 to ...

                                               

Nile crocodile

The Nile crocodile is the largest of the four crocodile species found in Africa. They have a long tail and powerful jaws. Their back feet are webbed for swimming. They can grow up to 20 ft in length and can weigh up to 1.500 lb. The males are usu ...

                                               

Noble orchid

The Noble Orchid is a cold hardy evergreen Orchid. It is a dwarf plant that blooms in the spring. Its petals are green, yellow-green or brown. It has pseudobulbs found below ground. The leaves are long and grass-like with serrated edges. It is fo ...

                                               

Nocturnal animals

Nocturnal animals are animals that are mainly active during the night. They hunt or feed during the night, and sleep during the day. Diurnal animals do it the other way around. Scientists sometimes use the word crepuscular to describe nocturnal a ...

                                               

Non-Hodgkin lymphoma

Non-Hodgkin lymphoma is a cancer of the lymphatic system. The lymphatic system is a network of vessels and glands spread throughout the body. It is also part of the immune system. Clear fluid called lymph flows through the lymphatic vessels and c ...

                                               

North American river otter

The North American river otter, or the common otter, is an aquatic mammal native to only North America in the countries Canada, and the United States. River otters are a distant relative of the weasel family. North American river otters can reach ...

                                               

North Pacific giant octopus

The North Pacific giant octopus is a big cephalopod in the coastal North Pacific. It usually lives at depths around lseters hey have also besSeven-arm octopus Haliphron atlanticus. Adults usually weigh around 15 kg 33 lb, with an arm span of They ...

                                               

Northern dwarf tree frog

The northern dwarf tree frog, dwarf tree frog, lined grass frog, green reed frog, Pandan frog, bicolored grass frog or northern sedge frog is a tree frog from Australia. It lives all along the coast of northern Australia. Adult frogs are about 3 ...

                                               

Northern snapping frog

The northern snapping frog, giant frog, giant burrowing frog, giant ground frog or Australian water-holding frog is a frog from northern Australia. It lives in Western Australia and the Northern Territory all the way to Queensland. This frog live ...

                                               

Northern white rhinoceros

The Northern white rhinoceros, or the Northern square-lipped rhinoceros, is one of the two subspecies of the white rhinoceros. These animals are extinct in the wild, but there are currently seven left in captivity. These seven lived in the Dvur K ...

                                               

Norwegian Forest cat

The Norwegian Forest cat is a breed of domestic cat found in Northern Europe. This breed is adapted to a very cold climate. It has a double coat. The top coat is glossy, long, water-shedding hairs. It also has a woolly undercoat for insulation. T ...

                                               

Nose

A nose is a body part which allows animals to smell things. The nose also helps animals breathe. It has parts that make it work and send messages to the brain. The noses parts include smell receptors and nerve connectors to receptors. In humans, ...

                                               

Nothofagus

Nothofagus is a kind of plant, also called southern beech. It is a tree which can reach 35 m tall. Nothofagus is found in South America, New Zealand, Australia and New Guinea. There are 34 species, considering pollen morphology four sections are ...

                                               

Notoceratops

Notoceratops was a ceratopsian dinosaur known only from a late Cretaceous jaw bone. Notoceratops walked on four sturdy legs, had a large head, a bulky body, a parrot-like beak, cheek teeth, and a small frill on its head.