Thanks for the A2A, Phani. The simple straight forward answer to your question is that electromagnetic radiation has little or nothing to do with the disappearance of birds that everyone is talking about. Unfortunately, it does seem as if there are fewer birds now than there once were. Once upon a time to look up at the sky in any big city, like Delhi, Bombay, Hyderabad or Lucknow was like looking at the Epiphany. The skies would be filled with birds of every description from huge vultures followed by the kites and the eagles and then all of the smaller birds right down to crows and sparrows. The funny thing about this scenario was that this eclectic collection of birds was not still. They would be continually dropping towards the earth and then rising back again on the thermals so that it looked like a ladder with all of these birds travelling up and down in the sky. Hence my earlier reference to the Epiphany. I was quite young then, in School , just back from staying abroad. I remember how strongly I was touched by the likeness, one could almost imagine that they were angels and not birds that were up there in the sky, reinforced perhaps by the huge wing span of many of the birds.

On a more macabre note, the parsi community can no longer put their dead in the Tower of Silence because there are not enough vultures remaining. One of the main reasons for this sudden decline in the number of birds is the proliferation of drugs that increase the yield of milk in cows, such as diclofenac, which apparently , once it gets into the food chain has the side effect of thinning the egg shells so that birds can’t procreate. Although, this is just a theory, it has been substantiated by studies and definitely does apply to the big carrion birds like vultures.

Radio signals are not the primary reason for the decline of sparrows. A lot of nests have been found near signal towers.
Though the number of sparrows is on a decline, they haven't completely disappeared. In fact, some ornithologists suggest that they are more frequently seen now, when there is a little bit more awareness about their plight.
The major reason cited for the decline is safe place to build the nests. Unlike the rock pigeons, who seem to be thriving in metro cities and modern design of the houses, sparrows are unable to find safe locations to build their nests. A lot of wild species do not reproduce when they are not sure of the living conditions, which worsens the situation.
For more information on sparrows, check out Houses for sparrows

Valid question -

Mobile radiation

There is no immediate effect when exposed to mobile radiation so far what we have, but its a slow killer and reports have suggested to see mobile radiation as a pollutant. Let alone birds and animals, it's detrimental to humans as well.

Mobile radiation is not the only cause for declain in birds population, may not even be a major chunk when compared to other sources of harm.

Agriculture to be blammed for major disturbance in ecology

Any reasons boils down to modern agricultural practices that shares major cause for the decline

Excessive use of chemicals in farming has complex effect on all living beings

Clearing habitats (all most all kinds ex: forest, wet lands, dry lands, grass lands etc.,) for agricultural purpose to feed 7 billion humans.

Over exploitation of available resources

Urban pollution of all kinds, cancerous development activities displacing wild life.

Another culprit is industrial revolution and world wars which introduced many technologies that perform against nature and natural arrangements, balances.

All the above reasons are creating scarcity of food , nesting sites, scarcity of living space, fresh air, unpolluted water, inducing disorders, decreases etc.,

I haven’t found anything in particular in the supplied link — it’s a large and sprawling site. In your comment on another reply, you mentioned OSHA signs on cell towers, which I’m afraid I’ve never seen, since I’m Canadian and don’t travel very much. (Is it possible for you to send me an image or a link?)

There have been no properly documented health effects caused by radio frequency (RF) radiation up to the teraHertz gap, other than from heating effects. I don’t know anything about health effects of teraHertz frequencies, which is why I make that point. Since they’re well below ionizing radiation in the electromagnetic spectrum, I doubt there’d be any major problems, but I don’t have any information to work with.

Being exposed to very powerful RF signals can be dangerous, simply from heating. I’ve read of people being severely burned from being too close to high-powered radar antennas. Cell towers operate at low power levels, typically around 10 watts ERP (Effective Radiated Power). That number indicates the effects of antenna design on the ability of a receiver to pick up a useful signal; the actual amount of power radiated is usually about 10% to 20% of the ERP figure. This amount of power isn’t a problem, as you can see from from the FCC’s page Human Exposure to Radio Frequency Fields: Guidelines for Cellular Antenna Sites.

There have been poorly documented accounts of chronic health problems among workers at Russian (actually, Soviet era) high-voltage electrical switchyards. Some researchers have attributed those health problems to the high voltage transformers (up to a million volts in some switchyards), but most of the material I’ve read suggests that the transformer oils used then were more likely culprit. PCB-based transformer oils were the most commonly used then, and those turned out to be nastier than we imagined.

I really can’t speculate on why there’d be OSHA warnings on cell towers, other than the usual warnings about falls and falling debris. It could be that they’re being over-cautious, and considering that we’re in a litigious age, I suppose I can see how that might happen. After all, we still see “turn off your cell phone” signs at gas stations, and that is total rubbish.

The only thing I can imagine causing problems for roosting birds might be from eating or nesting on some of the sealants and insulating materials. That’s all I can think of, at any rate.

So some birds are of migratory nature they migrate themselves by earth electromagnetic waves. When frequency and strength of signal increases then they follow EMR instead Earth electromagnetic waves and due to which they stuck in inhabitable region due to which they die.

We can calculate radiation in our area by using electromagnetic meters like this

They can tell us the radiation level in area or you can contact to TRAI for inspection. Legal limit is 0.5 mW/m^2. Hope you enjoyed Sister. Trust me because I am an electronic & communication engineer.

Yes but the bird would have to be sitting there for a long time. Hold your head about six inches away from a 100 watt light bulb. Do this long enough and you will suffer severe radiation burns. Move a foot away and it can still happen but it will take a much longer period of time. Three feet away and the bird will die of old age before it would die from the radiated energy. The easyes way to understand how radio waves will harm you is to think about how a light would harm you. How close could you stand to a 1000 or 1500 watt light bulb? Some AM radio stations put out 25,000 to 50,000 watts. Standing too close to them is going to fry your innards. But the radiation source for most radio stations are way up in the air. A bird sitting on top of an antenna of a radio station is in much more danger than it will ever be sitting on a cell phone tower. Yet we have been using AM, FM and UHF for about 100 years. With little or no real evidence that it has caused harm to wild life. On the other hand there was this guy—— Oh well that is a story for another time.

Yes they are, but not in the way you are thinking.
Cellular towers when getting the signal from the phone need to pass it along to the control centre and this can be done ether by cable in the ground or by a high density microwave beam. When you take a look at the cellular towers, most probably you could see a drum like white or grey boxes.
Those are directional microwave antennas, that are aimed at another such antenna on a nearby tower. They are very powerful since they need to transmit the entire tower traffic thru them, and they do that by having direct microwave beam blasting to another target antenna.
Those antennas are very warm, so in cold climates birds like to sit and even nest next to those antennas, most of the reclamations we had on those were because a bird actually broke thru the housing and made a nest inside the antenna itself. But those things are basically a microwave oven set at 300watt, which is not enough to cook the bird instantly, but sure is enough to kill it over time.

Your friend is either pulling your leg or is very bad at determining causal relationships. How does he know the 4G is killing them? Is he a bird pathologist that’s doing a necropsy on every single one?

The only way a bird could be killed by cellular RF energy is if it sat on a perch immediately in front of the antenna on a full-power base station, for hours on end without leaving. This would happen through internal heating. But have you ever tried to cook something with a light bulb? that’s essentially what would have to happen - a high power cellular base station operates around 50W. In cities, it’s much lower than that because cells cover much smaller areas. Even birds, as dumb as they are, will leave if they feel uncomfortable, which the internal heating would after a while.

Birds are known to be sensitive to magnetic radiation. Increasing number of cell phone towers in cities apparently are bringing down bird population. The microwaves (300 MHz to 300 GHz) emitted by cell phone towers and handsets has been found to be responsible for damaging eggs and embryos of sparrows.

Navigation skills of a bird are related to earth's natural magnetic system. The natural EMR and earth's magnetic field are directly proportional while technology induced EM waves are inversely proportional, they confuse birds hence are responsible for misdirection.

Various other reasons are cited for the disappearance of house sparrows such as introduction of unleaded petrol - combustion of which produces compounds such as methyl nitrite which is highly toxic for insects that form a major part of young sparrow's diet- widespread use of garden pesticides, vanishing open grasslands, rising air temperature and modern bird-unfriendly architecture

The very best tip, although not particularly useful, is to turn the phone off.

On a more serious note, using some form of hands-free system is better than holding the phone to your ear. Using it as a speaker phone; using a Bluetooth headset (Bluetooth uses much lower power levels than the cellular connection, and allow the phone to be several feet away); or even a corded earpiece and microphone should help (although some radiation will pass up the cord it is not likely to anywhere near as high as directly from the phone.

Shielding the phone does not help much as the phone will increase its power to compensate for losses caused by the shield. Net result - a shorter battery time.

Here are some key points regarding mobile radiation effects on birds:

1. Studies have shown that cell phone radiation can have negative effects on birds' health, behavior and ability to reproduce. Exposure to RF radiation has been linked to:

• Oxidative stress: The radiation can cause an increase in reactive oxygen species in bird cells, damaging DNA and proteins.
• Changes in hormone levels: Radiation exposure has been found to alter thyroid hormone levels and reproductive hormones in birds.
• Reduced fertility: Some studies have found that birds exposed to mobile phone radiation have lower success rates in breeding and egg hatching.
• Behavioral changes: Birds exposed to RF radiation have exhibited changes in sleeping patterns, foraging behavior and ability to navigate.

1. The extent of negative impacts depends on factors like radiation frequency, intensity and duration of exposure. Higher radiation levels tend to cause more damage.
2. To measure radiation levels in your area, you can use an RF meter or EMF meter. These tools measure electromagnetic fields, including radio frequencies from mobile towers and devices. You can monitor radiation levels both outside and inside your home.
3. To reduce radiation exposure, especially for birds nesting near your home:

• Limit the use of cell phones and wifi routers when possible.
• Keep some distance between you and your mobile devices when in use.
• Consider using a headset or speaker mode to move the phone away from your body.

Hope this helps! Let me know if you have any other questions.

No. Birds cannot die due to mobile tower radiation. Period. There is not any evidence that birds are dying due to mobile tower radiation and there’s no need for any evidence because it is simply not true.
Visible Light frequency is perhaps 1000 times more than the mobile tower radiation, and so is energy. But birds do live under the sun. Even tube lights, bulbs and led lamps in our home are more harmful than the mobile tower radiation.

However, there are some adverse impacts on birds due to mobile tower radiation and there has been done research on it. For example, it is proven fact that migratory birds are misguided due to such mobile tower radiation, and it can be drastic affect.

So, there is not direct effect of EMR on birds that causes death but indirectly due to some other effects their population decreases by increasing mobile tower radiation. For example, insects like fly and others who are source of food for birds don’t reside near base stations, not even in summer. So, obviously this place is not suitable for them. So, naturally such areas are not habitual fir them and so they don’t live there. But, the point is EMR don’t cause death for birds directly.

EDIT:

So, As Mentioned - you may not die but there ARE LOTS OF SIDE EFFECTS OF RADIATION WE ARE LIVING IN INDIA.

Watch for detailed Analysis by Professor at IIT Bombay:

We still cannot clearly say, its not only about the radio waves. The human activities have caused many other species to either become extinct or drastically reduce in numbers.

Radio waves don't cause any damage to the genes, also they are not powerful enough to cause heating issues. But birds have different sensors for flight and the radio waves are suspected to interfere with it.

Many reports by different departments of the government of India suggest that the radio waves are thr culprit behind the reduction in population of sparrows. But there haven't been any evidence of this in any lab report.