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NATURE (ANIMALS)

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Sina16

Iran, Islamic Republic Of

Hi,

how are you Dear friends?

let take a look at the some wonderful pictuers of the nature again

and try to make some questions about them & find the answers

this part (animals)

as you know animal means : beast; living organism which is neither plant nor human

regards

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Sina16

Iran, Islamic Republic Of

HI,

CatfishThis article is about the siluriform catfishes; for the Atlantic catfish, see Seawolf (fish); for other uses, see Catfish (disambiguation).Catfish (order Siluriformes) are a very diverse group of bony fish. Named for their prominent barbels, which give the image of cat-like whiskers, catfish range in size and behavior from the heaviest, the Mekong giant catfish in Southeast Asia and the longest, the wels catfish of Eurasia, to detritivores (species that eat dead material on the bottom), and even to a tiny parasitic species commonly called the candiru, Vandellia cirrhosa. There are armour-plated types and also naked types, neither having scales. Despite their common name, not all catfish have prominent barbels; what defines a fish as being in the order Siluriformes are in fact certain features of the skull and swimbladder. Catfish are of considerable commercial importance; many of the larger species are farmed or fished for food, and some are exploited for sport fishing, including a kind known as noodling. Many of the smaller species, particularly the genus Corydoras, are important in the aquarium hobby''.

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Sina16

Iran, Islamic Republic Of

Hi,

DogfishIn freshwater lakes and rivers, "Dogfish" refers to a member of the Bowfin family.

The name dogfish is applied to a number of small sharks found in the northeast Atlantic, Pacific, and Mediterranean, especially those in the three families Scyliorhinidae, Dalatiidae and Squalidae. Although often used in reference to Scyliorhinus canicula, the name is applied only loosely and does not usually signify a close taxonomic relationship. The Spiny Dogfish (Squalus acanthias) are the most common sharks in the western Atlantic Ocean. They hunt both solitarily and in schools. They eat small fish, squid, and crustaceans, and have extremely strong jaws for crushing the shells. They are considered a nuisance by fishermen because they will latch on to almost anything put in the water, including human hands. Some fishermen kill them when caught which, along with pollution, has contributed to a sharp decline in population in Puget Sound. It is now illegal to kill or mutilate them when caught. Care has to be taken when handling because they have 2 poisonous spines at the back of both dorsal fins. The poison is not likely to cause major damage, but the wound can take months to heal.

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Sina16

Iran, Islamic Republic Of

Hi,

SalmonSalmon is the common name for several species of fish of the family Salmonidae. Several other fish in the family are called trout. Salmon live in both the Atlantic and Pacific Oceans, as well as the Great Lakes and other land locked lakes.

Typically, salmon are anadromous: they are born in fresh water, migrate to the ocean, then return to fresh water to reproduce. Folklore has it that the fish return to the exact spot where they were born to spawn; research indicates that at least 90% of the fish that spawn in a particular stream were born there. In Alaska, the crossing-over to other streams allows salmon to populate new streams, such as those that emerge as a glacier retreats. The precise method salmon use to navigate has not been entirely established, though their keen sense of smell is involved. In all species of Pacific salmon, the mature individuals die within a few days or weeks of spawning, a trait known as semelparity. However, even in those species of salmon that may survive to spawn more than once (iteroparity), post-spawning mortality is quite high (perhaps as high as 40 to 50%.) Those species average about two or, perhaps, three spawning events per individual.

regards

Sina16

Iran, Islamic Republic Of

Hi,

TroutTrout is the common name given to a number of species of freshwater fish belonging to the salmon family, Salmonidae.

All fish called trout are members of the subfamily Salmoninae. The name is commonly used for species in three of the seven genera in the sub-family: Salmo, which includes Atlantic species; Oncorhynchus, which includes Pacific species; and Salvelinus, which includes fish also sometimes called char or charr. Fish referred to as trout include:

Genus Salmo

Adriatic trout, Salmo obtusirostris
Brown trout, Salmo trutta
Flathead trout, Salmo platycephalus
Marmorata, Soca River trout or Soča trout – Salmo trutta marmoratus
Ohrid trout, Salmo letnica
Sevan trout, Salmo ischchan

regatds

Sina16

Iran, Islamic Republic Of

Hi,

The goldfish (Carassius auratus auratus) was one of the earliest fish to be domesticated, and is still one of the most commonly kept aquarium fish. A relatively small member of the carp family (which also includes the koi carp and the crucian carp), the goldfish is a domesticated version of a dark-gray/olive/brown carp native to east Asia (first domesticated in China) that was introduced to Europe in the late 17th century. The mutation that gave rise to the goldfish is also known from other cyprinid species, such as common carp and tench.

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Sina16

Iran, Islamic Republic Of

Hi,

Frogs are amphibians in the order Anura (meaning "tail-less", from Greek an-, without + oura, tail), formerly referred to as Salientia (Latin salere (salio), "to jump"). Most frogs are characterized by long hind legs, a short body, webbed digits (fingers or toes), protruding eyes and the absence of a tail. Frogs are widely known as exceptional jumpers, and many of the anatomical characteristics of frogs, particularly their long, powerful legs, are adaptations to improve jumping performance.

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Sina16

Iran, Islamic Republic Of

Hi,

MonkeyA monkey is any member of either the New World monkeys or Old World monkeys, two of the three groupings of simian primates, the third group being the apes. The New World monkeys are classified within the parvorder Platyrrhini, whereas the Old World monkeys (superfamily Cercopithecoidea) form part of the parvorder Catarrhini, which also includes the apes. Thus, scientifically speaking, monkeys do not form a "natural group", in that the Old World monkeys are actually more closely related to the apes than they are to the New World species. There are 264 known extant species of monkey. Because of their similarity to monkeys, apes such as chimpanzees and gibbons are often called monkeys in informal usage, though they are not monkeys. Conversely, due to its size (up to 1 m) the Mandrill is often thought to be an ape, but it is actually an Old World monkey. Also, a few monkey species have the word "ape" in their common name. Because they are not a single coherent group, monkeys do not have any particular traits that they all share and are not shared with the remaining group of simians, the apes

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Sina16

Iran, Islamic Republic Of

Hi,

StorkStorks are large, long-legged, long-necked wading birds with long stout bills, belonging to the family Ciconiidae. They occur in most of the warmer regions of the world and tend to live in drier habitats than the related herons, spoonbills and ibises; they also lack the powder down that those groups use to clean off fish slime. Storks have no syrinx and are mute, giving no bird call; bill-clattering is an important mode of stork communication at the nest. Many species are migratory. Most storks eat frogs, fish, insects, earthworms, and small birds or mammals. There are 19 living species of storks in six genera.