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Admin: Created page with "'''Invertebrates''' are divided into a number of phyla – Sponges – have sieve-like bodies with an internal sketeton of mineral crystals. Classified as the phylum '''''Por..."

2021-04-18T21:53:32Z

Created page with "'''Invertebrates''' are divided into a number of phyla – Sponges – have sieve-like bodies with an internal sketeton of mineral crystals. Classified as the phylum '''''Por..."

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 Pitohuis are birds endemic to New Guinea. The skin and feathers of some pitohuis contain powerful neurotoxic alkaloids
-New Zealand wrens, '''''Acanthisittidae''''', are a family of tiny passerines endemic to New Zealand. They are understood to form a distinct lineage within the passerines, but authorities differ on their assignment to the oscines or suboscines
+New Zealand wrens, '''''Acanthisittidae''''', are a family of tiny passerines endemic to New Zealand. They are understood to form a distinct lineage within the passerines, but authorities differ on their assignment to the oscines or suboscine
+== Mammals ==
-'''Mammals''' (class '''''Mammalia''''') are a clade of endothermic amniotes distinguished from the reptiles and the birds by the possession of hair, three middle ear bones, mammary glands in females, and a neocortex (a region of the brain). All female mammals nurse their young with milk, which is secreted from special glands, the mammary glands
+Mammals (class '''''Mammalia''''') are a clade of endothermic amniotes distinguished from the reptiles and the birds by the possession of hair, three middle ear bones, mammary glands in females, and a neocortex (a region of the brain). All female mammals nurse their young with milk, which is secreted from special glands, the mammary glands
 Mammals can be divided into three groups – those that lay eggs (Prototheria), those that give birth to live young like marsupials (Metatheria) and placental mammals (Eutheria)

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-'''Invertebrates''' are divided into a number of phyla –
+== Invertebrates ==
 Sponges – have sieve-like bodies with an internal sketeton of mineral crystals. Classified as the phylum '''''Porifera''''', there are about 15,000 species
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 Hagfish, the class Myxini, are eel-shaped, slime-producing, marine fish (occasionally called slime eels). They are the only known living animals that have a skull but no vertebral column
+== Fish ==
-A '''fish''' is any member of a group of organisms that consist of all gill-bearing aquatic craniate animals that lack limbs with digits. Most fish have sensitive receptors that form the lateral line system, which detects gentle currents and vibrations, and senses the motion of nearby fish and prey. Many bony fish have an internal organ called a swim bladder that adjusts their buoyancy through manipulation of gases. Dorsal fins are located on the back, the caudal fin is the tail fin, paired pectoral fins are located on each side, pelvic fins located below the pectoral fins, and the anal fin is located on the ventral surface behind the anus
+A fish is any member of a group of organisms that consist of all gill-bearing aquatic craniate animals that lack limbs with digits. Most fish have sensitive receptors that form the lateral line system, which detects gentle currents and vibrations, and senses the motion of nearby fish and prey. Many bony fish have an internal organ called a swim bladder that adjusts their buoyancy through manipulation of gases. Dorsal fins are located on the back, the caudal fin is the tail fin, paired pectoral fins are located on each side, pelvic fins located below the pectoral fins, and the anal fin is located on the ventral surface behind the anus
 Coarse fish – those types of freshwater fish other than game fish (trout, salmon and char)
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 Lungfish (also known as salamanderfish) are freshwater fish. Lungfish have the ability to breathe air. All lungfish have two lungs, with the exception of the Australian lungfish, which only has one
+== Amphibians ==
-'''Amphibians''' are ectothermic, tetrapod vertebrates of the class '''''Amphibia'''''. The three modern orders of amphibians are Anura (the frogs and toads), Caudata (the salamanders), and Gymnophiona (the caecilians). The total number of known amphibian species is approximately 7000, of which nearly 90% are frogs.
+Amphibians are ectothermic, tetrapod vertebrates of the class '''''Amphibia'''''. The three modern orders of amphibians are Anura (the frogs and toads), Caudata (the salamanders), and Gymnophiona (the caecilians). The total number of known amphibian species is approximately 7000, of which nearly 90% are frogs.
 Frogs are amphibians in the order '''''Anura''''' (meaning ‘tail-less’, from Greek)
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 Caecilians are an order ('''''Gymnophiona''''') of amphibians that superficially resemble earthworms or snakes. Caecilians completely lack limbs. They mostly live hidden in the ground. Eggs are fertilized internally. Some species lay eggs, but in others the eggs are retained inside the female’s body, emerging as gilled larvae or as small adults
+== Reptiles ==
-'''Reptiles''', the class '''''Reptilia''''', comprise turtles, crocodilians, snakes, lizards and tuatara, as well as many extinct groups. A reptile is any amniote (a tetrapod whose egg has an additional membrane, originally to allow them to lay eggs on land) that is neither a mammal nor a bird. Unlike mammals, birds, and certain extinct reptiles, living reptiles have scales or scutes (rather than fur or feathers) and are cold-blooded
+Reptiles, the class '''''Reptilia''''', comprise turtles, crocodilians, snakes, lizards and tuatara, as well as many extinct groups. A reptile is any amniote (a tetrapod whose egg has an additional membrane, originally to allow them to lay eggs on land) that is neither a mammal nor a bird. Unlike mammals, birds, and certain extinct reptiles, living reptiles have scales or scutes (rather than fur or feathers) and are cold-blooded
 Several living subgroups are recognized: Testudines (turtles, terrapins and tortoises): approximately 400 species; Sphenodontia (tuatara): 2 species; Squamata (lizards, snakes, and worm lizards): over 9600 species; Crocodilia (crocodiles, gavials, caimans, and alligators): 25 species
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 Spectacled, broad-snouted, dwarf – species of caiman
+== Birds ==
-'''Birds''' (class Aves) ranks as the tetrapod class with the most living species, approximately 10,000. Extant birds belong to the subclass Neornithes, living worldwide and ranging in size from the 5 cm bee hummingbird to the 2.75 m ostrich. The fossil record indicates that birds emerged during the Jurassic period
+Birds (class Aves) ranks as the tetrapod class with the most living species, approximately 10,000. Extant birds belong to the subclass Neornithes, living worldwide and ranging in size from the 5 cm bee hummingbird to the 2.75 m ostrich. The fossil record indicates that birds emerged during the Jurassic period
 Birds are divided into two superorders – Palaeognathae, which contains the tinamous and ratites, amd Neognathae which contains 27 orders

Physical World/Animals - Revision history

QRNeditor: Formatting edits

QRNeditor: Formatting edits

Admin: Created page with "'''Invertebrates''' are divided into a number of phyla – Sponges – have sieve-like bodies with an internal sketeton of mineral crystals. Classified as the phylum '''''Por..."