In animals, moulting (Commonwealth English) or molting (American English) is the routine shedding off old feathers in birds, or of old skin in reptiles, or of old hairs in mammals (see also coat (dog)). Commonwealth English is intended as a collective term for the perceived standard English language used in the Commonwealth of Nations1, applying in theory to Australian English, British English, Caribbean English, Canadian English, Hiberno-English (Irish English)2, Hong Kong English3, Indian English (includes Pakistani English), formal Malaysian English, New Zealand... American English (AmE) is the dialect of the English language used mostly in the United States of America. ... Closeup on a single white feather A feather is one of the epidermal growths that forms the distinctive outer covering, or plumage, on a bird. ... Orders Many - see section below. ... Orders See text. ... Hair with a round cross-section will fall straight, as opposed to curly hair, which has a flat cross-section Hair is a filamentous outgrowth of the skin found only in mammals. ... Orders Subclass Multituberculata (extinct) Plagiaulacida Cimolodonta Subclass Palaeoryctoides (extinct) Subclass Triconodonta (extinct) Subclass Eutheria (includes extinct ancestors)/Placentalia (excludes extinct ancestors) Afrosoricida Artiodactyla Carnivora Cetacea Chiroptera Cimolesta (extinct) Creodonta (extinct) Condylarthra (extinct) Dermoptera Desmostylia (extinct) Embrithopoda (extinct) Hyracoidea Insectivora Lagomorpha Litopterna (extinct) Macroscelidea Mesonychia (extinct) Notoungulata (extinct) Perissodactyla Pholidota Plesiadapiformes... A dogs coat is its fur. ...

In arthropods, such as insects, arachnids and crustaceans, moulting describes the shedding of its exoskeleton (which is often called its shell), typically to let it grow. See ecdysis. Subphyla and Classes Subphylum Trilobitomorpha Trilobita - trilobites (extinct) Subphylum Chelicerata Arachnida - spiders, scorpions, etc. ... Classes & Orders Subclass:Apterygota Orders Archaeognatha (Bristletails) Thysanura (Silverfish) Monura - extinct Subclass:Pterygota Infraclass: Paleoptera (paraphyletic) Orders Ephemeroptera (mayflies) Palaeodictyoptera - extinct Megasecoptera - extinct Archodonata - extinct Diaphanopterodea - extinct Protodonata - extinct Odonata (dragonflies and damselflies) Infraclass: Neoptera Superorder: Exopterygota Orders Caloneroptera - extinct Titanoptera - extinct Protorthoptera - extinct Grylloblattodea (ice-crawlers) Mantophasmatodea (gladiators) Plecoptera... Orders See text. ... Classes Class Branchiopoda Subclass Phyllopoda Subclass Sarsostraca Class Remipedia Order Enantiopoda Order Nectiopoda Class Cephalocarida Order Brachypoda Class Maxillopoda Subclass Mystacocarida Subclass Copepoda Subclass Branchiura Subclass Pentastomida Subclass Tantulocarida Subclass Thecostraca Infraclass Cirripedia Class Ostracoda Order Metacopina Subclass Myodocopa Subclass Podocopa Class Malacostraca Subclass Eumalacostraca Subclass Hoplocarida Subclass Phyllocarida The... An exoskeleton, in contrast to an endoskeleton, is an external anatomical feature that supports and protects an animals body. ... Look up shell in Wiktionary, the free dictionary. ... Ecdysis is the molting of the cuticula in arthropods and related groups (Ecdysozoa). ...

Moulting in Arachnids

The exoskeleton of an arachnid is hard. This does not allow for growth. To overcome this problem, arachnids shed their old shells, letting a new larger shell to replace it. The new larger shell fits underneath the old shell, because it is still elastic. A layer of fluid separates the new and old shells. As the old shell is shed, the new shell expands to its full size, before hardening on contact with air. The arachnid has to flex its new exoskeleton, or it will become inflexible and less mobile until its next moult. Other reasons for moulting are damaged tissue and missing limbs. Over a series of moults, a missing limb can be regenerated, the stump being a little larger with each moult until it is of normal size again. After moulting, the shell is still delicate and the arachnid is vulnerable to predators or even to its own prey. An exoskeleton, in contrast to an endoskeleton, is an external anatomical feature that supports and protects an animals body. ... Orders See text. ... This article or section contains information that has not been verified and thus might not be reliable. ...

The Process of Moulting with Spiders - especially Tarantulas

Before moulting, some spiders will not eat for weeks, while others will eat up to the moment of moulting. Likewise, after a moult, some spiders will not eat for days or even weeks. For other uses, see: Tarantula (disambiguation) Genera Subfamily Acanthopelminae    Acanthopelma Subfamily Aviculariinae    Avicularia    Ephobopus    Pachistopelma    Psalmopoeus    Tapinauchenius Subfamily Eumenophorinae    Anoploscelus    Batesiella    Citharischius    Encyocrates    Eumenophorus    Hysterocrates    Loxomphalia    Loxoptygus    Monocentropus    Myostola    Phoneyusa    Polyspina Subfamily Harpactirinae    Ceratogyrus    Coelogenium    Eucratoscelus    Harpactira    Pterinochilus Subfamily Ischnocolinae    Chaetopelma    Cratorrhagus    Heterothele    Ischnocolus    Nesiergus    Plesiophrictus/Neoplesiophrictus Subfamily Ornithoctoninae    Citharognathus...

• The moulting commences, when a split appears on the side of a carapace part of the cephalothorax (head and upper body).
• The split continues horizontally along the opisthosoma (abdomen) and opens like a box.
• The spider pushes its body out of the old skin, after which it withdraws its legs from it.
• The spider rests for a period, varying from minutes for spiderlings, to more than a day for a large mature tarantula.

The cephalothorax is an anatomical term used of arachnid and malacostracan arthropods for the first major body section. ... For other uses, see: Tarantula (disambiguation) Genera Subfamily Acanthopelminae    Acanthopelma Subfamily Aviculariinae    Avicularia    Ephobopus    Pachistopelma    Psalmopoeus    Tapinauchenius Subfamily Eumenophorinae    Anoploscelus    Batesiella    Citharischius    Encyocrates    Eumenophorus    Hysterocrates    Loxomphalia    Loxoptygus    Monocentropus    Myostola    Phoneyusa    Polyspina Subfamily Harpactirinae    Ceratogyrus    Coelogenium    Eucratoscelus    Harpactira    Pterinochilus Subfamily Ischnocolinae    Chaetopelma    Cratorrhagus    Heterothele    Ischnocolus    Nesiergus    Plesiophrictus/Neoplesiophrictus Subfamily Ornithoctoninae    Citharognathus...

Moulting in Insects

Insects need to moult as they grow because their hard exoskeletons do not allow much room for expansion. Each stage in the development of an insect between moults is called an instar, or stadium. Classes & Orders Subclass:Apterygota Orders Archaeognatha (Bristletails) Thysanura (Silverfish) Monura - extinct Subclass:Pterygota Infraclass: Paleoptera (paraphyletic) Orders Ephemeroptera (mayflies) Palaeodictyoptera - extinct Megasecoptera - extinct Archodonata - extinct Diaphanopterodea - extinct Protodonata - extinct Odonata (dragonflies and damselflies) Infraclass: Neoptera Superorder: Exopterygota Orders Caloneroptera - extinct Titanoptera - extinct Protorthoptera - extinct Grylloblattodea (ice-crawlers) Mantophasmatodea (gladiators) Plecoptera... An exoskeleton, in contrast to an endoskeleton, is an external anatomical feature that supports and protects an animals body. ... An instar is a developmental stage of arthropods, such as insects, between each molt. ...

Magicicadas moulting

Higher insects tend to have fewer instars (4-5) than lower insects (anywhere up to ~15). Higher insects have more alternatives to moulting, such as expansion of the cuticle and collapse of air sacs to allow growth of internal organs. Download high resolution version (966x870, 161 KB)Emerging Cicada, by user Lorax File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Download high resolution version (966x870, 161 KB)Emerging Cicada, by user Lorax File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ...

The process of moulting in insects begins with the separation of the cuticle from the underlying epidermal cells apolysis and ends with the shedding of the old cuticle ecdysis. In many of them it is initiated by an increase in the hormone ecdysone. This hormone causes: Eacles imperialis caterpillar undergoing apolysis Apolysis is the separation of the cuticula from the epidermis in arthropods and related groups (Ecdysozoa). ... Ecdysis is the molting of the cuticula in arthropods and related groups (Ecdysozoa). ... A hormone (from Greek horman - to set in motion) is a chemical messenger from one cell (or group of cells) to another. ... Ecdysone is a prohormone of the major insect moulting hormone 20-hydroxyecdysone. ...

• • Apolysis - the separation of the cuticle from the epidermis
  • Excretion of new cuticle beneath the old
  • Degredation of the old cuticle.

After apolysis, moulting fluid is secreted into the space between the old cuticle and the epidermis (the exuvial space), this contains inactive enzymes which are activated only after the new epicuticle is secreted. This prevents them from digesting the new procuticle as it is laid down. The lower regions of the old cuticle - the endocuticle and mesocuticle - are then digested by the enzymes and subsequently absorbed. The exocuticle and epicuticle resist digestion and are hence shed at ecdysis. Eacles imperialis caterpillar undergoing apolysis Apolysis is the separation of the cuticula from the epidermis in arthropods and related groups (Ecdysozoa). ... Epidermis could refer to: In plants, the outermost layer of cells covering the leaves and young parts of a plant is the epidermis. ... Excretion is the biological process by which an organism chemically separates waste products from its body. ... Eacles imperialis caterpillar undergoing apolysis Apolysis is the separation of the cuticula from the epidermis in arthropods and related groups (Ecdysozoa). ... Ecdysis is the molting of the cuticula in arthropods and related groups (Ecdysozoa). ...

Moulting in birds

Moulting in birds is a comparatively slow process, as a bird never sheds all its feathers at once; it must keep enough of its feathers to regulate its body temperature and repel moisture. Some species of wild bird become flightless during an annual "wing moult" and must seek protected habitat with a reliable food supply during that time. A moulting bird should never have any bald spots. If a pet bird has any bald spots, the bird should be taken to an avian veterinarian to search for possible causes for the baldness, which may include giardia, mites, or feather-plucking. An avian veterinarian is a veterinarian who has undertaken additional training to treat birds. ... Binomial name Giardia lamblia (Kunstler, 1882) Giardia lamblia (formerly also Lamblia intestinalis) is a protozoan parasite that infects the gastrointestinal tract of humans. ... Families Tetranychidae - Spider mites Eriophyidae - Gall mites Sarcoptidae - Sarcoptic Mange mites The mites and ticks, order Acarina or Acari, belong to the Arachnida and are among the most diverse and successful of all the invertebrate groups, although some way behind the insects. ... Feather-Plucking occurs in many bird species world-wide for a variety of reasons. ...

The process of moulting

1. The bird begins to shed some old feathers
2. Pin feathers grow in to replace the old feathers
3. As the pin feathers become full feathers, other feathers are shed

This is a cyclical process that happens in many phases. In general, a moult begins at a bird's head, progresses down the body to its wings and torso, and finishes with the tail feathers. A pin feather, sometimes called a blood feather, is a developing feather on a bird. ...

Moulting in Reptiles

The most familiar example of moulting in reptiles is when snakes "shed their skin". This is usually achieved by the snake rubbing its head against a hard object, such as a rock or piece of wood, causing the already stretched skin to split. At this point, the snake continues to rub its skin on objects, causing the end nearest the head to peel back on itself, until the snake is able to crawl out of its skin, effectively turning the molted skin inside-out. This is similar to how you might remove a sock from your foot by grabbing the open end and pulling it over itself. The snake's skin is often left in one piece after the molting process. Orders See text. ... Superfamilies and Families Henophidia Aniliidae Anomochilidae Boidae Bolyeriidae Cylindrophiidae Loxocemidae Pythonidae Tropidophiidae Uropeltidae Xenoplplplpeltidae Typhlopoidea Anomalepididae Leptotyphlopidae Typhlopidae Xenophidia Acrochordidae Atractaspididae Colubridae Elapidae Hydrophiidae Viperidae Snakes are cold blooded legless reptiles closely related to lizards, which share the order Squamata. ... Diagram of the layers of human skin In zootomy and dermatology, skin is an organ of the integumentary system composed of a layer of tissues that protect underlying muscles and organs. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... To meet Wikipedias quality standards, this article or section may require cleanup. ...

Moulting in Crayfish

Crayfish also need to moult as they grow because their hard exoskeletons do not allow much room for expansion. Baby crayfish can moult daily, but as they grow older, the periods between moults increases to weeks or months. Families Astacoidea   Astacidae   Cambaridae Parastacoidea   Parastacidae Crayfish, sometimes called crawfish, are freshwater crustaceans resembling small lobsters, to which they are closely related. ... An exoskeleton, in contrast to an endoskeleton, is an external anatomical feature that supports and protects an animals body. ...

The early signs of moulting include lack of appetite and a slow down in activity. During this period the crayfish ingests calcium into an internal organ, rather than to the exoskeleton. An exoskeleton, in contrast to an endoskeleton, is an external anatomical feature that supports and protects an animals body. ...

When the crayfish is ready to moult, it moves onto its back and begin fanning its pincers, legs and swimmerettes (under the tail) in order to get as much oxygen as possible. The carapace begins to crack behind the head. The new appendages then pierce the old shell and after about five minutes a sudden violent movement detaches the old shell from the crayfish.

The freshly moulted crayfish will invariably be larger as part of the growing process, but is vulnerable in two ways because its shell is very soft:-

(1) It is vulnerable to predators, including fish and other crayfish.

(2) The crayfish cannot move around as easily as normal.

The crayfish needs to eat its old shell to replace the lost calcium and stengthen the weakned carapace.

External links

• Crayfish Moult Very rare crayfish moulting video
• PLOS primer: How the Ecdysozoan Changed Its Coat