Spider Hunting Strategies

Stabbing, crushing, spitting and seducing are some of the more unusual, gruesome and clever ways spiders catch and kill their prey.

Though these predators are best known for ensnaring their food in sticky webs and paralyzing them with venom, this is only one of many ways the world's 40,000 or so known spider species catch a meal.

Spiders are found everywhere from rain forests to deserts, and can even be found in tide pools along the coast. What they eat, and how they capture it, is just as varied as where they live. Spiders catch and consume insects, other spiders and even small animals including snakes and birds.

The above fishing spider waits near water, typically with their front legs resting on the surface to detect the vibrations of potential prey. Once an animal comes close enough, fishing spiders strike with their fangs.

Net-casting spiders, below, hang upside down on a scaffold of silk, spin fuzzy webs they hold tight between two of their front legs and wait for insects. If a flying insect comes within reach, net-casting spiders will sweep their net toward the prey, snagging it out of the air. If an insect passes underneath them, the spiders drop down and spread a net over the victim.

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Tracking Whale Sharks With Astronomical Algorithms

With the help of algorithms designed to guide the Hubble telescope’s starscape surveys, conservation-minded coders have designed software that helps biologists identify whale sharks by their spots. The program enlists the help of citizens with cameras, and lets researchers track Earth’s biggest fish across time and oceans.

If you put a tag in the whale shark's skin, it wears off or falls away. But using this method scientists can recognize these animals without marking them, and it’s permanent.

The researchers developed a pattern recognition program that mapped X- and Y-coordinates of spots, then compared them between whale shark photographs

Soon they were joined by a NASA astrophysicist who introduced them to an astronomer who’d developed algorithms to compare photographs of the night sky and determine what star patterns they had in common.  The scientists adapted the equations to instead study whale sharks.

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Eight potentially new fish species found along Bali reefs

Scientists have found eight potentially new species of reef fish and a potentially new species of bubble coral in waters surrounding the Indonesian island of Bali.

The species haven’t been named. The fish, with their genus in parenthesis, are:

– Two types of cardinalfish (in the genuses of Apogon and Siphamia).
– Two types of dottybacks (Manonichthys and Pseudochromis).
– A garden eel (Heteroconger).
– A sand perch (Parapercis).
– A fang blenny (Meiacanthus).
– A goby (Grallenia).

Above are pictures of the Manonichthys (top) and Parapercis (bottom).

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The World's Ants Captured in 3D

Scientists have taken on a project to create detailed images of all approximately 12,000 known species of ants.  Below are several examples:

Click here to learn more about the ants depicted in these images.

Ghostly ‘Winged’ Octopus Caught on Camera

A rarely seen white deep-sea octopus has been captured on camera in high definition by researchers. The octopus features two “wings” which make it look just like the ghosts from Mario videogames, aka Boos.

The Grimpoteuthis bathynectes octopus, also nicknamed the Dumbo octopus, was filmed with an HD video camera at a depth of more than 6,500 feet about 200 miles off the coast of Oregon.

Little is known about the deep-sea octopuses, which live near the hydrothermal vent fields — fissures in the Earth’s surface generally found near volcanically active places that release geothermally heated water.

Original article here.

World’s Biggest Gathering of Whale Sharks

To see a single whale shark — the world’s largest fish, a solitary behemoth that can grow to school-bus size — is a rare experience.

Seeing hundreds gathered in one place is unprecedented.

The so-called "Afuera gathering" took place in August 2009 off the northern tip of the Yucatan Peninsula, not far from the waters around Cabo Catoche. Dozens of whale sharks have converged there each summer since 2002, drawn by crustaceans that feed on massive plankton blooms fueled by upswellings of nutrient-rich deep-sea water.

The Afuera whale sharks are just eating, not mating; the mating habits of whale sharks are a mystery to biologists. The gathering contained no juveniles, only adults; biologists don’t actually know where juvenile whale sharks live, where they’re born or even how they’re born. Whale sharks are literally a colossal mystery.

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High-Speed Video Shows How Hummingbirds Really Drink

New high-speed videos of hummingbirds overturn nearly two centuries of conventional wisdom on how they drink.

Researchers previously thought tube-like channels in their tongues sucked up fluid by capillary action. But the new analysis shows that their tongues actually trap nectar by curling around it.

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Humpback Whales May Be Migratory Astronomers

An eight-year project that tracked humpback whale migrations by satellite shows the huge mammals follow uncannily straight paths for weeks at a time.

The results suggest a single migratory mechanism isn’t responsible. Instead, humpbacks may use a combination of the sun’s position, Earth’s magnetism and even star maps to guide their 10,000-mile journeys.

According to scientists, they are going across some of most turbulent waters in the world, yet they keep going straight.  They’re orienting with something outside of themselves, not something internal.

Humpback whales feed during the summer near polar oceans and migrate to warm tropical oceans for the winter, where they mate and calves are born. A one-way trip can last upwards of 5,000 miles, making the cetaceans the farthest-migrating animal on Earth. (One was tracked migrating 6,200 miles).

To better understand humpback migrations, scientists embedded satellite tags in seven South Atlantic and nine South Pacific whales from 2003 through 2010.  The researchers found that, despite surface currents, storms and other distractions, the humpbacks never deviated more than about 5 degrees from their migratory courses.  In about half the segments mapped by the researchers, humpbacks deviated by one degree or less.

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Orangutans Use Simple Tools to Catch Fish

Orangutans swim about as well as they fly, but research on three Indonesian islands shows that these long-limbed apes nonetheless catch and eat fish.

Orangutans living in Borneo scavenge fish that wash up along the shore and scoop catfish out of small ponds for fresh meals.  Over two years, scientists saw several animals on these forested islands learn on their own to jab at catfish with sticks, so that the panicked prey would flop out of ponds and into a red ape’s waiting hands.

Although orangutans usually fished alone, scientists observed pairs of apes catching catfish on a few occasions. In one case, an orangutan cringed and pulled away as its companion extracted a fish from a pond. Scientists suspect that the onlooker was learning — or at least trying to learn — how to nab aquatic snacks.

Observations of fishing by orangutans raise the likelihood that hominids ate meat, including fish, before the emergence of the Homo genus around 2.5 million years ago. Anthropologists have traditionally held that meat-eating first assumed prominence among early Homo species and fueled brain expansion.

Fishing isn’t common among primates, but it does occur. Chimpanzees occasionally pluck fish out of ponds. Some monkeys that swim well, including certain macaque and baboon species, also catch fish with their hands.

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Salamander Has Algae Living Inside Its Cells

In a symbiotic union more complete than any previously found in vertebrates, the common spotted salamander lives with algae inside its cells.

Such a degree of cross-species fusion was long thought to exist only among invertebrates, whose immune systems are not primed to destroy invaders. But algae live inside the salamanders from before birth, possibly passed down from parent to offspring.

That spotted salamanders and algae live in symbiosis was first noted in the 19th century, and in the 20th century researchers worked out the relationship’s mutual benefits. Salamander eggs provide a nitrogen-rich environment for algae to grow; algae oxygenate the embryos, which develop deformities without them.

But algae were believed to float outside the embryo itself, in the egg’s nutrient broth.  Now scientists have noted that algae’s distinctive green glow didn’t just emanate from eggs, but from inside embryos.

Algae invade spotted salamander embryos early in their development, when individuals are just beginning to take shape inside their eggs, as the brain folds up and tissue layers-to-be first organize themselves. As an embryo develops, algae suffuses its body, but most becomes concentrated along its gut and alimentary canal.

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