CURIOSITÀ DAL MONDO ANIMALE – Parte II

curiosità

Siamango – Hylobates syndactylus CURIOSITÀ – Il Siamango presenta sulla gola un vistoso rigonfiamento in corrispondenza della laringe. Questa specie di sacca si gonfia durante l’emissione dei suoni e permette un vasto repertorio di vocalizzazioni dai toni decisamente alti e talmente forti da poter essere udite anche a chilometri di distanza.…

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CURIOSITÀ DAL MONDO ANIMALE – Parte I

curiosità

Squalo grigio – Carcharhinus plumbeus CURIOSITÀ – Lo Squalo grigio è una specie vivipara: tipo di riproduzione in cui, a differenza della oviparità e della ovoviviparità, l’embrione non si sviluppa all’interno di un uovo che sia stato, rispettivamente, deposto o trattenuto nell’ovidotto, ma, al contrario, viene accolto e si sviluppa all’interno dell’utero…

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BLACK PANTHER? NO MELANIC LEOPARD

Javan Leopard (Panthera pardus melas, Cuvier 1809), melanic form Black Panther is the common name by which are called the blacks specimens (melanic variants) of some species of felines. Zoologically speaking, the term Panther is synonymous with Leopard. The genus Panthera is a taxonomic category that includes all species of…

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SENSORY ORGANS: VIEW OF OWLS

As many of you know, the sight of owls is particularly developed. The development of their vision system, however, is different from the diurnal birds of prey. In the latter, the view is developed towards a higher definition of images, thanks to a high concentration of cones in their fovea…

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MIMICRY? NO, I’M IN A BAD MOOD

Yemen or Veiled Chameleon (Chamaeleo calyptratus, Duméril and Bibron 1851) Some species of chameleons, but not all, can change the colour of their skin. The principal reason to the change of tone is not the camouflage (mimicry) but the manifestation of certain physical or physiological, or emotional states such as…

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L’ORIGINE DELLE SPECIE

Tutti noi conosciamo, abbiamo studiato a scuola o, per lo meno, abbiamo sentito parlare della Teoria della selezione naturale di Charles Darwin ma quanti possono dire di averla capita a fondo o di ricordarsela? Vediamo di fare un piccolo riassunto di quel voluminoso e quanto mai rivoluzionario testo “L’origine delle…

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A RAINBOW TO DISORIENT

Agalychnis callidryas (Cope, 1862) is a tree frog of the family Hylidae, widespread in Central America. It is known by the common name of the red-eyed tree frog. Many scientists believe that this frog has developed his big red-fire eyes to scare predators and get them to ask some questions…

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DISCOVERED THE FIRST FISH WARM-BLOODED

Just like Mammals and Birds (and, according to some theories, even some species of Dinosaur), the Kingfish or Opah (Lampris guttatus Brunnich, 1788), a sea fish belonging to the family Lampridae and order Lampridiformes, is warm-blooded. The discovery of some American researchers, recently published in Science, is sensational. It is…

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GIVE ME FIVE

The hand is an extraordinary appendix, but is not exclusive to human: we share it with all the primates, but also with bats, cats, frogs and even dolphins. Charles Darwin pointed out this strange coincidence in his The Origin of Species. “What’s more unique,” he wrote, “that the hand of…

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LEUCISM O ALBINISM?

White tigers are not true “albino” (it is not albinism) and are characterized by brown or black stripes and blue eyes  with pink nose. In fact, these specimens, are suffering from Leucism. Color variation is considered a mutation caused by a recessive gene that inhibits the yellow pigmentation of the…

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