Birds in hot weather: how to help them survive dehydration

When the thermometer rises above thirty degrees, we seek refuge in air conditioners, cold drinks, and shaded parks. But what about those who have neither an air conditioner nor a refrigerator, nor even the option to simply seek shade? Birds are among the most vulnerable creatures during the summer heat. They cannot unbutton a coat or drink a glass of water from the tap. Their bodies are complex thermal machines that work at their limit in the heat. While humans can consciously drink more water, birds rely on instincts and chance. But we, as humans, can help. And it doesn't require great effort, yet brings immense results.

How birds regulate body temperature

Birds are endothermic creatures, and their body temperature is usually higher than that of humans: for passerines, it reaches 40–42 degrees. In the heat, they need to release excess heat to avoid overheating. The main cooling mechanism for them is evaporation. However, unlike humans, birds almost do not sweat: they lack sweat glands. Instead, they use respiration: rapid, superficial breathing with their beak open, resembling a dog's "panting." This is called polyphagy — rapid ventilation of air through the lungs with evaporation of moisture from the mucous membranes.

However, this mechanism leads to massive water loss. In intense heat, a bird may lose up to 5% of its body weight per hour due to evaporation. And if water reserves are not replenished, dehydration sets in — a condition that quickly becomes critical. That's why we often see birds with their beaks open, sitting motionless in the shade on hot days. It's not laziness — it's a struggle for life.

Where birds get water in the city

In the natural environment, birds have many sources of water: streams, puddles, dew on grass, raindrops on leaves. But in cities, this natural balance is disrupted. Asphalt and concrete heat up to 60–70 degrees and almost do not absorb moisture. Puddles evaporate quickly or become dirty. Fountains are often inaccessible to small birds due to high edges or work only intermittently. As a result, birds find themselves in a water shortage at the most inappropriate time.

Young birds, who have not yet learned to find water, and fledglings, who have just left the nest, are especially affected. They can quickly die of dehydration within a few hours if there is no source of moisture nearby. Therefore, human help becomes critically important.

How to properly set up a bird bath

The simplest and most effective way to help birds is to install a bird bath. It can be a regular bowl, a small plate, or even a can lid. The main rules:

• The bird bath should be stable and shallow — no more than 2–3 cm deep so that the bird cannot drown.
• The water should be fresh, change it daily (and twice a day in intense heat).
• Place the bird bath in a shaded area so that the water does not heat up under the sun — in hot water, bacteria multiply instantly, and it becomes dangerous.
• The bottom of the bird bath should not be slippery — you can put a small stone or stick to help the bird hold on easily.
• Do not use chlorinated tap water — let it sit for at least a couple of hours so that the chlorine evaporates.

If you have a garden or a balcony, you can make a bird bath out of an old plate or even a plastic bottle cut in half. The main thing is to keep it clean regularly. Dirty water is a source of infections that can kill more birds than the heat itself.

When and how to best feed birds in the heat

In intense heat, birds need not only to drink but also to eat. However, caution is important here: food spoils faster in the heat, and improper nutrition can do more harm than good. Ideally, offer birds juicy foods: apples, pears, watermelon rinds, berries. They provide not only nutrition but also additional moisture.

As for dry foods — seeds, grains, cereals — it's better to give them in the morning or evening when the heat subsides. In the height of the heat, they can take away water from the bird for digestion, exacerbating dehydration. And it is categorically forbidden to use salty and fried products — they are dangerous for birds at any time of the year.

It is important to remember: the water bowl is more important than the feeder in the heat. A bird can do without food for a day or two, but without water, only a few hours.

Creating shaded areas and protection from overheating

Besides water, birds need shade in the heat. If you have the opportunity, plant shrubs or place umbrellas in places where birds are most often. On a balcony, you can fix a small awning or secure a dense fabric to create shade. Even an inverted bucket can create a lifesaving island of shade on hot ground.

It is also useful to leave shallow containers with water not only for drinking but also for bathing. Birds, especially sparrows and pigeons, enjoy taking "baths," which helps them cool down. Just make sure there are no oily films in the water and change it regularly.

What to do if you find a dehydrated bird

If you see a bird sitting on the ground with closed eyes, breathing heavily, and not trying to fly away when approached, this may be a sign of serious dehydration or heatstroke. What can be done?

1. Carefully place the bird in the shade — on grass, in a bush, in a cardboard box with air holes.
2. Offer water in a small container, but do not force it to drink — if the bird is weak, it may choke. It's better to just put it next to and step back.
3. You can moisten the beak with water from a syringe without a needle, dropping a drop on the edge of the beak — the bird will swallow if it wants to.
4. Do not try to feed the bird bread or other solid food — this can worsen its condition.
5. If the condition is severe and the bird does not respond, it is better to contact a veterinarian or volunteers specializing in wild birds.

It is important: do not take a chick that has just learned to fly and landed on the ground. In the heat, the parents are usually nearby and bring water and food. Taking such a chick away can deprive it of its chance of natural survival.

Why helping birds in the heat is an important ecological mission

Birds are not just "beautiful creatures." They are a crucial element of the ecosystem. They pollinate plants, disperse seeds, regulate the number of insects. A decrease in the bird population in cities leads to a balance disruption: for example, a sharp increase in the number of mosquitoes or caterpillars that destroy greenery. Moreover, birds are an indicator of environmental health. If birds are doing poorly, it means we will soon be uncomfortable too.

Helping birds in the heat is not an act of sentimentality, but a reasonable ecological habit. It does not require a lot of time or money, but brings real changes. And when we put a bowl of water on the windowsill, we are not just saving one sparrow — we are supporting the life of the city as a whole.

Conclusion

Heat is a challenge for all living creatures, but birds are especially vulnerable. We, as humans, with our intelligence and abilities, can and should help them survive the hot days. A bowl of water in the shade, a drop of water on a leaf, a little care — and thousands of birds will get a chance to live. It's not hard, not expensive, but infinitely important. And remember: when we help those who are weaker, we become a little more human.

Permanent link to this publication: