Dead birds rain down on towns half a world apart.
http://www.peteducation.com/article.cfm?cls=15&cat=18&articleid=2874
It is still possible of course that it is kept secret. But such is becoming less likely considering the broad range of these bird kills, both in number and duration.
Birds are highly sensitive to Teflon fumes, but also to methane for instance. So, I always "concluded" that these massive bird deaths should be attributed to something like that.Three weeks ago thousands of crows, pigeons, wattles and honeyeaters fell out of the sky in Esperance, Western Australia.
Then last week dozens of grackles, sparrows and pigeons dropped dead on two streets in Austin, Texas.
As birds continue to die in Esperance and the town's dawn chorus remains eerily silent, vets in both countries have been unable to establish a cause of death - despite carrying out a large number of autopsies on the birds.
http://www.peteducation.com/article.cfm?cls=15&cat=18&articleid=2874
And thus, this type of toxicosis due to toxic fumes/gasses (teflon or methane) should at least have left its traces in the autopsies. And it does not. So my "conclusion" was premature.Birds are susceptible to a respiratory condition called "teflon toxicity" or "PTFE poisoning/toxicosis." Deaths can result from this condition, which is due to the noxious fumes emitted from overheated cookware coated with polytetrafluoroethylene (PTFE). This chemical is found on most non-stick cookware and appliances, some stain repellant products, and other household items.
What are the signs of PTFE toxicosis?
The signs of PTFE toxicosis are non-specific, and could be seen in a variety of respiratory and other diseases. Birds are usually found dead in the cage or gasping for air and eventually dying. Mild exposures may result in difficulty breathing, wheezing, incoordination, weakness, depression, anxious behavior, or seizures.
The diagnosis of PTFE poisoning is usually made through physical examination, a history of using an item with a non-stick surface that was possibly overheated, and, if the bird has died, a post-mortem examination. The toxic particles released by overheated PTFE mainly affect the lungs. On post-mortem examination, the lungs are often dark red in color, with hemorrhages and congestion. Hemorrhages and congestion may also appear in the trachea and bronchi. These changes are not specific to PTFE toxicosis, but occur with many types of lung irritants, so there is no way PTFE toxicosis can be positively identified. Other toxic irritants include aerosol sprays, tobacco smoke, carbon monoxide, natural gas, ammonia, and burned foods and cooking oils. The signs associated with exposure to these toxins vary from mild chronic pneumonia to acute death.
It is still possible of course that it is kept secret. But such is becoming less likely considering the broad range of these bird kills, both in number and duration.
So what could be the real cause ???The overheating of PTFE has been found to cause lung problems, not only in birds, but also in rats and humans. In people, the disease has flu-like symptoms and is known as "polymer fume fever." It is rarely fatal, although it can cause serious illness, especially in people with underlying respiratory disease.
Why are birds more sensitive to PTFE toxicosis?
The respiratory tract of birds is extremely sensitive to toxins in the air because of its unique anatomy. It is extremely efficient in exchanging gasses in order to provide very high levels of oxygen to the muscles for flight. While delivering oxygen so efficiently, it can also deliver toxic gasses. In addition, the small size and high metabolic rate of birds increases their susceptibility to airborne toxins. Birds, often canaries, have historically been utilized as sentinels for toxic gasses in coal mines because of this increased sensitivity.