Bird flu is understood as a viral pneumonia in birds. Of course, based on the biological laws of nature, pneumonia appears as a symptom of the regeneration phase of a territory or possession-protection conflict. However, it may initially be difficult to accept that birds could have emotional conflicts…
Yet, upon closer examination, it quickly becomes clear that one of the most important organs for birds is their lungs, and it’s no coincidence that this organ reacts primarily when they perceive a threat.
Birds are nature’s messengers. Due to their elevated position, they gain information about approaching events much earlier than animals confined to the ground without the ability to fly, and they quickly vocalize this information.
One of the most obvious natural occurrences of territory marking through sound is observed in birds, which typically use their songs to signal to other individuals that a given area is already claimed, prompting others to find a nesting spot farther away. It’s noticeable that in spring, while conditions for nesting are still forming, birds are extremely vocal. Once they feel their territory is secure, they quiet down. It’s likely that the communication between them during this time is not about singing lofty odes but rather about the agitated, perhaps crude, vocal battles of winged creatures protecting their territory or position. For example: “Why don’t you go back to your own branch, you ‘cracked-beak’?! Can’t you see this chestnut tree is already taken? Keep your five-meter distance, and don’t let me catch you in my foliage again!”
If a species is so uniquely skilled at marking territory through sound, it’s certain that a high-performance lung is at work in the background. And indeed, this is the case.
Birds possess a unique respiratory system specialized for their high metabolic demands, particularly during flight. Although their lungs are relatively small compared to those of mammals, they are connected to a system of air sacs that significantly increases the total volume available for gas exchange. This complex structure allows their total respiratory volume to be roughly twice that of similarly sized mammals.
One of the most distinctive features of bird respiration is unidirectional airflow. Unlike mammals, which have tidal breathing (where air flows in and out through the same path), birds maintain a constant lung volume during both inhalation and exhalation. The expansion and contraction of their bellows-like air sacs cause air to flow in one direction through the lungs. This continuous flow ensures that the lungs always contain fresh, oxygen-rich air, maximizing gas exchange efficiency. Thanks to these adaptations, birds can extract 75–85% of the oxygen from inhaled air, far surpassing the 25% efficiency of humans. This is critical for high-energy activities like high-altitude flight or migration.
The air sacs not only aid in respiration but also assist in vocalization. They enable birds to regulate airflow through the syrinx (the vocal organ). This precise control of airflow allows birds to produce a wide range of sounds, including complex songs, with great accuracy, even during flight.
If birds’ lungs are so efficient, how can they still develop changes?
Just as our environment is constantly changing, so is the environment of animals, including birds. Except for a few species—like the common swift, which can stay airborne for months without landing—most birds require terrestrial shelter to survive and reproduce, which, for flying birds, typically means trees. If, for example, a forest fire breaks out, trees are cut down, or the food source in an area disappears, birds lose their habitat. A smaller habitat forces individuals to compete more actively for territory or spend more time in the air, which requires adaptation and can lead to changes in the lung epithelium.
The same can happen with domesticated poultry if their living space shrinks or too many rivals are suddenly introduced, such as when a younger flock joins the group, prompting them to prepare to defend their territory and food.
The biological purpose of lung epithelium changes is to create a larger-diameter lung through epithelial degeneration, enabling the bird to perform more confidently and loudly during a temporary threat. Once the issue is resolved, the thinned tissues begin to regenerate with the help of viruses—this phenomenon is bird flu.
It’s important to note that this text does not aim to be comprehensive and only touches on part of the topic. The nature of animals’ conflicts can vary depending on their living conditions, so the specific triggers should be examined on a case-by-case basis, considering the species, environment, and caretaker. Further information on this topic can be explored during training sessions or personal consultations.
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