venerdì 18 settembre 2009

Lo Squalo

Sharks (superorder Selachimorpha) are a type of fish with a full cartilaginous skeleton and a highly streamlined body. The earliest known sharks date from more than 420 million years ago, before the time of the dinosaurs.
Since that time, sharks have diversified into 440 species, ranging in size from the small dwarf lanternshark, Etmopterus perryi, a deep sea species of only 17 centimetres (7 in) in length, to the whale shark, Rhincodon typus, the largest fish, which reaches approximately 12 metres (39 ft) and which feeds only on plankton, squid, and small fish through filter feeding. Sharks are found in all seas and are common down to depths of 2,000 metres (6,600 ft), and some live even deeper but they are almost entirely absent below 3,000 metres (9,800 ft). They generally do not live in freshwater, with a few exceptions such as the bull shark and the river shark which can live both in seawater and freshwater. They respire with the use of five to seven gill slits. Sharks have a covering of dermal denticles that protect their skin from damage and parasites and improve fluid dynamics so the shark can move faster. They have several sets of replaceable teeth.

giovedì 17 settembre 2009

L'Emu

The Emu, Dromaius novaehollandiae, is the largest bird native to Australia and the only extant member of the genus Dromaius. It is also the second-largest extant bird in the world by height, after its ratite relative, the ostrich. The soft-feathered, brown, flightless bird reach up to 2 metres (6.6 ft) in height. The Emu is common over most of mainland Australia, although it avoids heavily populated areas, dense forest, and arid areas. Emus can travel great distances at a fast, economical trot and, if necessary, can sprint at 50 km/h (31 mph) for some distance at a time. They are opportunistically nomadic and may travel long distances to find food; they feed on a variety of plants and insects.
The etymology of the common name Emu is uncertain, but is thought to have come from an Arabic word for large bird that was later used by Portuguese explorers to describe the related Cassowary in Australia and New Guinea.

mercoledì 16 settembre 2009

Le Mucche di Farmville

Allevate a birra, come il manzo Kobe

martedì 15 settembre 2009

L'Aragosta Gigante

È particolarmente apprezzata in cucina per la bontà della sua carne, tuttavia è una specie protetta inclusa nell'appendice III della Convenzione di Berna.
In alcune ricette viene applicato il metodo della cottura a vivo in acqua bollente.
Si nutre di plancton, alghe, spugne, anellidi, echinodermi,briozoi, crostacei e pesci, a volte anche carcasse di questi.
È una specie gregaria e piuttosto sedentaria, si trovano spesso insieme numerosi esemplari.
Un'aragosta su 4.000.000 è di colore blu. L'alto contenuto di emocianina nella loro emolinfa - circolazione comune di sangue e linfa - da la colorazione viola, la quale però è mantenuta soltanto quando l'aragosta resta in profondità. Alla luce del sole o in superficie il colorito viola svanisce. Spesso l'aggiunta di ammoniaca ai crostacei fissa la colorazione rossa o viola.

lunedì 14 settembre 2009

Il Serpente Marrone Australiano

The Eastern Brown Snake (Pseudonaja textilis), often referred to as the Brown Snake, is an elapid snake native to Australia. It is one of the world's deadliest snakes. This, combined with a native habitat which includes the well-populated east coast of Australia, has resulted in fatalities.
The Eastern Brown Snake is the second most venomous land snake in the world after the Inland Taipan.
Their venom is very toxic, and can be fatal; even juveniles have caused human fatalities. The venom contains both neurotoxins and blood coagulants.
Eastern Brown Snakes are also highly aggressive. Compared to most snakes that will flee when ever possible, Brown Snakes are much more likely to stand their ground, heightening the danger in an encounter.
Despite the potency of the venom, the pressure immobilisation first-aid technique is highly effective (as it is for all Australian venomous snakes). If correct first-aid and safety protocols are followed, the chances of death from Eastern Brown Snake are minimal.

venerdì 11 settembre 2009

Il Cockatoo (Sulphur crested Cockatoo)

The Oxford English Dictionary dates the word cockatoo from the 17th century, and records the derivation from the Malay name for these birds, kaka(k)tua (either from kaka "parrot" + tuwah, or "older sister" from kakak "sister" + tua, "old"), via the Dutch kaketoe; the word cock possibly influencing. Seventeenth century variants include cacato, cockatoon and crockadore, and cokato, cocatore and cocatoo from the eighteenth.The derivation has also been used for the family and generic names Cacatuidae and Cacatua respectively.
The family has an Australasian distribution, ranging from the Philippines and the eastern Indonesian islands of Wallacea to New Guinea, the Solomon Islands and Australia.
The Sulphur-crested Cockatoo, Cacatua galerita, is a relatively large white cockatoo found in wooded habitats in Australia and New Guinea. They can be locally very numerous, leading to them sometimes being considered pests. They are very popular in aviculture.

giovedì 10 settembre 2009

L'Iguana Iggy

Le iguane sono rettili affini alle lucertole, ma più grossi e relativamente più lenti. Allo stato adulto possiedono una caratteristica cresta sul dorso, molto più evidente nei maschi che nelle femmine. Anche la testa presenta un accentuato dimorfismo sessuale: le femmine hanno una testa arrotondata, i maschi triangolare.
Di mattina al nascere del sole si svegliano e vanno a cercare il punto più diretto al sole, dove rimangono per qualche ora. Essendo rettili non possono regolare la propria temperatura e quindi devono mettersi all'ombra nelle ore più calde della giornata. La loro dieta è prevalentemente erbivora, anche se nello stomaco di questi sauri sono stati talvolta ritrovate tracce di insetti; l'interpretazione più comune, tuttavia, era che fossero stati ingoiati per caso.