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Australia: Thirsty Koala Stops Cyclist to Take a Drink Amid Heatwave
A video posted on Instagram by cyclist Anna Heusler shows the desperate marsupial climbing onto the frame of a bicycle to get a better sip.
The cyclists, who were riding towards Adelaide in 40°C (104°F) heat, spotted the koala as they came around a bend on the road. "Naturally, we stopped because we were going to help relocate him off the road," Heusler told Australia's 7 News, as reported in the New Zealand Herald.
A desperate koala suffering through the soaring temperatures in South Australia approached a group of cyclists to drink from a water bottle.https://t.co/jV9mM4xn9y— nzherald (@nzherald) December 28, 2019
"I stopped on my bike and he walked right up to me, quite quickly for a koala, and as I was giving him a drink from all our water bottles, he actually climbed up onto my bike.
"None of us have ever seen anything like it."
Koalas Suffering in Heat Wave
The pictures are heartwarming, but the incident also shows the dangers posed to the animals' existence by the current fire situation in the country. At least 2,000 koalas died in devastating and widespread bushfires across South Australia and the east coast of the continent, a parliamentary inquiry heard earlier in December.
The animals died either in bushfires or from starvation and dehydration afterwards, North East Forest Alliance president and ecologist Dailan Pugh told the inquiry.
Director of the Total Environment Centre Jeff Angel warned that the risk to koalas' survival was at emergency level due to the bushfires, which have caused loss of habitat for the marsupials. "We urge the government to do more, and quickly," Angel told News Ltd on Saturday.
The assessment of the situation facing Australia's koalas comes as its government drew criticism for a badly timed tourism campaign costing Aus$15 million ($10.5 million, €9.4 million). The campaign depicts scenes of cuddly koalas and blue skies — in stark contrast to current media images of Australia's inferno-like conditions.
Reposted with permission from DW.
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The ghoulishly named ogre-faced spider can "hear" with its legs and use that ability to catch insects flying behind it, the study published in Current Biology Thursday concluded.
"Spiders are sensitive to airborne sound," Cornell professor emeritus Dr. Charles Walcott, who was not involved with the study, told the Cornell Chronicle. "That's the big message really."
The net-casting, ogre-faced spider (Deinopis spinosa) has a unique hunting strategy, as study coauthor Cornell University postdoctoral researcher Jay Stafstrom explained in a video.
They hunt only at night using a special kind of web: an A-shaped frame made from non-sticky silk that supports a fuzzy rectangle that they hold with their front forelegs and use to trap prey.
They do this in two ways. In a maneuver called a "forward strike," they pounce down on prey moving beneath them on the ground. This is enabled by their large eyes — the biggest of any spider. These eyes give them 2,000 times the night vision that we have, Science explained.
But the spiders can also perform a move called the "backward strike," Stafstrom explained, in which they reach their legs behind them and catch insects flying through the air.
"So here comes a flying bug and somehow the spider gets information on the sound direction and its distance. The spiders time the 200-millisecond leap if the fly is within its capture zone – much like an over-the-shoulder catch. The spider gets its prey. They're accurate," coauthor Ronald Hoy, the D & D Joslovitz Merksamer Professor in the Department of Neurobiology and Behavior in the College of Arts and Sciences, told the Cornell Chronicle.
What the researchers wanted to understand was how the spiders could tell what was moving behind them when they have no ears.
It isn't a question of peripheral vision. In a 2016 study, the same team blindfolded the spiders and sent them out to hunt, Science explained. This prevented the spiders from making their forward strikes, but they were still able to catch prey using the backwards strike. The researchers thought the spiders were "hearing" their prey with the sensors on the tips of their legs. All spiders have these sensors, but scientists had previously thought they were only able to detect vibrations through surfaces, not sounds in the air.
To test how well the ogre-faced spiders could actually hear, the researchers conducted a two-part experiment.
First, they inserted electrodes into removed spider legs and into the brains of intact spiders. They put the spiders and the legs into a vibration-proof booth and played sounds from two meters (approximately 6.5 feet) away. The spiders and the legs responded to sounds from 100 hertz to 10,000 hertz.
Next, they played the five sounds that had triggered the biggest response to 25 spiders in the wild and 51 spiders in the lab. More than half the spiders did the "backward strike" move when they heard sounds that have a lower frequency similar to insect wing beats. When the higher frequency sounds were played, the spiders did not move. This suggests the higher frequencies may mimic the sounds of predators like birds.
University of Cincinnati spider behavioral ecologist George Uetz told Science that the results were a "surprise" that indicated science has much to learn about spiders as a whole. Because all spiders have these receptors on their legs, it is possible that all spiders can hear. This theory was first put forward by Walcott 60 years ago, but was dismissed at the time, according to the Cornell Chronicle. But studies of other spiders have turned up further evidence since. A 2016 study found that a kind of jumping spider can pick up sonic vibrations in the air.
"We don't know diddly about spiders," Uetz told Science. "They are much more complex than people ever thought they were."
Learning more provides scientists with an opportunity to study their sensory abilities in order to improve technology like bio-sensors, directional microphones and visual processing algorithms, Stafstrom told CNN.
"The point is any understudied, underappreciated group has fascinating lives, even a yucky spider, and we can learn something from it," he told CNN.
In 'Road Map for a More Sustainable Future,' NY Regulator Tells Banks to Consider Climate Risks in Planning
By Brett Wilkins
Regulators in New York state announced Thursday that banks and other financial services companies are expected to plan and prepare for risks posed by the climate crisis.
There are many different CBD oil brands in today's market. But, figuring out which brand is the best and which brand has the strongest oil might feel challenging and confusing. Our simple guide to the strongest CBD oils will point you in the right direction.
A NASA spacecraft has successfully collected a sample from the Bennu asteroid more than 200 million miles away from Earth. The samples were safely stored and will be preserved for scientists to study after the spacecraft drops them over the Utah desert in 2023, according to the Associated Press (AP).
Exxon Mobil will lay off an estimated 14,000 workers, about 15% of its global workforce, including 1,900 workers in the U.S., the company announced Thursday.
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