Scientists explore animals' instinct for calamity
After tsunamis, scientists examine how wildlife had warning
09:19 PM CST on Saturday, January 8, 2005
By DON OLDENBURG / The Washington Post
WASHINGTON – In Khao Lak, 50 miles north of Phuket along Thailand's western coast, a dozen elephants giving tourists rides began trumpeting hours before the Dec. 26 tsunamis – about the time the 9.0-magnitude quake fractured the ocean floor. An hour before the wall of waves slammed the resort area, the elephants reportedly again grew agitated and began wailing. Just before disaster struck, they headed for higher ground, some breaking their chains to flee. Flamingos that breed this time of year at Point Calimere sanctuary on India's southern coast left for safer forests well before the tsunamis hit, forest officials told the India News.
And while large turtles have been found dead in the debris along the shore of Indonesia's devastated Aceh province, the tsunamis' impact on wildlife was "limited," said Frank Momberg, coordinator for emergency response in Aceh for the conservation group Fauna & Flora International.
Tales of animals behaving strangely before the quake and of wildlife escaping to safety have abounded in the wake of the tsunamis, raising questions about what animals knew that humans didn't – and what, if anything, can be learned from them.
Reports go back centuries of animals' sixth sense in detecting hurricanes, earthquakes, tsunamis and volcanic eruptions long before the earth starts shaking. Rats racing from buildings, sparrows taking flight in flocks, dogs howling incessantly – it's an impressive track record, though anecdotal.
After the Dec. 26 tsunamis, a Danish man staying at Ao Sane Beach, north of Phuket, wrote on a Danish Web site: "Dogs are smarter than all of us. ... [They] started running away up to the hilltops long before we even realized what was coming."
At the hard-hit Yala National Park in Sri Lanka, stunned wildlife officials reported that hundreds of elephants, leopards, tigers, wild boar, deer, water buffaloes, monkeys and smaller mammals and reptiles had escaped unscathed.
Science is iffy on a subject that, for obvious reasons, is difficult to replicate in a laboratory. And there are always explanations and theories that mitigate the mystery of the anecdotes. In the case of the tsunamis, said Ken Grant, project coordinator at the Humane Society International Asia office in Bali, Indonesia, a lot of animals escaped simply because they tend to live inland, in the forest.
Nevertheless, some scientists are looking for explanations of why some species behave strangely before natural catastrophes by correlating the animals' sensory abilities with microscopic and invisible sensory stimuli.
"I don't know if I'd call this a sixth sense so much as a better sense," Mr. Grant said. "Most animals know that when the ground starts to shake, something is wrong."
Animals' sensory physiology – super-sensitive to sound, temperature, touch, vibration, electrostatic and chemical activity and magnetic fields – gives them a head start in the days and hours before natural calamities.
"It appears a lot of animals have sensory organs that detect these micro-tremors and micro-changes that we cannot possibly monitor," said George Pararas- Carayannis, a former University of Hawaii oceanographer and geophysicist who leads the Tsunami Society.
"It's a sensitivity that we humans don't have. But animals, through millions of years of evolution, have developed it, and that's how they have been able to survive as a species. It is run or perish," said Mr. Pararas-Carayannis, author of the 2001 book The Big One: The Next Great California Earthquake – Why, Where, and When It Will Happen .
Why not humans? When an imminent disaster so unimaginably primal as this occurs, can only creatures in tune with nature at its most elemental sense it coming?
Research shows that many fish are sensitive to low-frequency vibrations and detect tremors long before humans. The bullhead catfish detects magnitude-2 earthquakes so weak that people can't feel them at the top of 10-story buildings, said John Caprio, a biological sciences professor at Louisiana State University specializing in fish senses.
Other animals are also extremely sensitive to ground vibrations. Lynette Hart, professor of animal behavior at the University of California-Davis, says that's what probably cued the elephants, which most likely felt the quake in their feet and trunks. Elephants, she said, are known to "lay their trunks on the ground when an airplane or truck generates large seismic noise," as if to feel it.
With the elephant's intelligence – its brain is the largest of terrestrial creatures – "they can figure out what direction the stimulus is coming from, how strong it is, and what evasive action to take," Dr. Hart said.
Some animals may have heard the tsunami coming from the moment the quake erupted under the ocean.
Species of birds, dogs, elephants, tigers and other animals can detect "infrasound" – frequencies in the range of 1 to 3 hertz, compared with humans' 100- to 200-hertz range, said psychobiologist James Walker, director of the Sensory Research Institute at Florida State University. "It's sensitivity to such a low frequency range that most people wouldn't call it sound anymore."
The Naked Ape author and animal behavioralist Desmond Morris says cats and dogs are sensitive to sudden electromagnetic changes like those that precede an earthquake, which is why "many dogs shiver and become scared when a thunderstorm is approaching."
"Canines' sense of smell is 10,000 to 100,000 times superior to that of humans," said Dr. Walker, who is starting research to train dogs to detect bladder and prostate cancer in human urine. Dogs' olfactory senses are so sensitive – they're said to be able to smell fear – that it's possible they could pick up on chemical changes in the air before an earthquake.
There's evidence that not all animals pick up on disasters, said Ben Hart, Lynette Hart's husband and a UC-Davis professor of animal physiology. His studies have shown that domestic animals' pre-quake behavior is inconsistent.
"It is only a few earthquakes that are preceded by unusual behavior," he said. "Most are not, and we don't have the slightest idea why."
Ruth Buskirk, a senior lecturer in biological sciences at the University of Texas at Austin, says one reason may be "background noise" – the clutter of sensory stimuli before quakes.
In 1981, she reviewed the unusual behavior of eels, frogs, snakes, turtles, sea birds, pigeons, chickens, dogs, cats, horses, cows, deer, rats and mice before 36 quakes on four continents. She crunched data every which way.
"Our main conclusion was, boy, the animals can sense anything, including very minor changes that happen before earthquakes, but there's so much background noise during an earthquake" that it's unclear what stimuli the animals are reacting to, she said.
it is a long article but it basically states how no animal corpses have really been found and several reports of animals 'knowing' the tsunami was coming. Amazing...
