Friday, March 30, 2012
Friday, March 23, 2012
Thursday, March 22, 2012
Tuesday, March 20, 2012
Why don't spiders stick to their own web?
Researchers have identified three factors that combined to prevent the spiders from sticking: leg hairs that decreased the surface area available to stick; a chemical coating on the hairs that reduced the adhesion and the delicate way the spiders move their legs.
"Spiders reduce their adhesion to the sticky lines in their webs by moving their legs carefully so as to allow the sticky lines to slide off easily," Dr Eberhard told BBC Nature.
Under the microscope, the researchers saw that when a spider made contact with a sticky line the adhesive droplets were transferred to its leg hairs.
Then, as the spider withdrew its leg from the web, the droplets slid down these non-stick hairs and dripped off the fine point at the end.
Monday, March 19, 2012
Sunday, March 18, 2012
Saturday, March 17, 2012
Thursday, March 15, 2012
Portraits by David Boni
Photographer David Boni takes beautiful portraits of everyday animals, and in doing so, makes us believe in the power of well-executed portraiture. With their heads raised high, these animals look nothing short of noble.
The creative work of artist Rob Mulholland, these sculptures are made out of mirrored Perspex (or acrylic glass). It has been called the Predator effect after the 1987 film where an alien life form seamlessly blends into its background. Mulholland has previously installed these chameleon-like figures in the woods around Alloa, Loch Ard and the David Marshall Lodge in Scotland.
Wednesday, March 14, 2012
Stop learning about cephalopods? Nautilus I have to!
With a perfect snail like shell and most octopus characteristics, this curious creature is considered the lost link between cephalopods (squids, octopus) and the rest of the mollusks. A living fossile which has survived without many changes for hundreds of millions of years.
Nautilus are predators. They dig in sand near coral reefs, looking for shrimps, crabs and small fish to feed. Their tentacles are tiny and without suckers, and they don’t ave good eyes. But in compensation, they have up to 90 tentacles with a powerful grip and a very sharp sense of smell.
Cuttlefish, you're the tops.
A cephalopod is any member of the molluscan class Cephalopoda (Greek plural Κεφαλόποδα (kephalópoda); "head-feet"). Cephalopods are the most intelligent, most mobile, and the largest of all molluscs. Squid, octopuses, cuttlefish, the chambered nautilus, and their relatives display remarkable diversity in size and lifestyle with adaptations for predation, locomotion, disguise, and communication. Their lengthy evolutionary history spans an impressive 500 million years and the abundant fossils they've left behind (mostly shelled nautiloids and ammonoids) record repeated speciation and extinction events. From myths about their enigmatic fossilized remains to fantastic accounts of tentacled sea monsters, cephalopods also figure prominently in the literature and folklore of human societies around the world.
Tuesday, March 13, 2012
Sunday, March 11, 2012
Thursday, March 8, 2012
Polychaetes (bristle worms), survive intense sea pressures where sunlight never penetrates. Instead of a barren wasteland on the ocean floor, scientists have discovered diverse communities of creatures that live on and around hydrothermal vents. These scale worms are hosts to symbiotic bacteria that may be providing them with nutrients. "The deep sea realm is one of the most diverse habitats on Earth, yet our perception of it is still in its infancy," says Daniel Desbruyeres, a senior researcher at Ifremer, France.
Wednesday, March 7, 2012
Monday, March 5, 2012
Friday, March 2, 2012
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