Study indicates that crows make decisions twice as fast as humans and monkeys

Many dog and cat owners tend to consider initial reactions, such as the first seizure or lack of coordination while walking, as passing events. However, these signs can indicate serious problems in the animal's nervous system, including brain tumors, which affect both dogs and cats.

It is a fact that pets can develop conditions similar to human ones, such as epilepsy, herniated discs, meningitis, and brain tumors. The main difference lies in the diagnosis, which is often late because owners often do not know about the existence of specialized professionals in the field.

To fill this gap, Iconvet, a veterinary clinic located in Rio Vermelho, in Salvador, dedicated its focus to neurology since its inauguration in 2019.

According to the clinic, several symptoms warn that the animal needs a specialized neurological evaluation. Among them are seizures or episodes of loss of consciousness; disorientation, behavioral confusion, or inability to recognize familiar environments and people;

Other indicators include sudden changes in temperament, such as apathy or aggression; visual changes, such as sudden blindness or pupils of different sizes; motor difficulties in getting up, walking, or maintaining coordination of movements;

Warning signs also include repeatedly walking in circles toward a specific side, frequently rubbing the head (indicating discomfort), involuntary loss of control of urine or feces, or pressing the head against rigid surfaces like walls.

It is important to emphasize that not every seizure implies the presence of a tumor, and each symptom can have distinct origins. For this reason, a consultation with a neurologist is the essential initial step. If the animal suddenly stops walking, the clinic's advice is to treat it as an emergency and seek immediate medical assistance.

The process of diagnosing neurological diseases in animals involves a meticulous clinical examination, complemented, when necessary, by laboratory and imaging tests. These may include X-rays, CT scans, and cerebrospinal fluid analysis, the fluid that surrounds the brain and spinal cord. Based on these findings, the specialist veterinarian determines whether the ideal management will be through continuous medication, other forms of therapy, or surgical intervention.

Specifically regarding brain tumors, Iconvet stands out as the only clinic in Bahia that performs brain surgeries on dogs and cats for tumor removal, using state-of-the-art equipment, such as the neuronavegador. The operating room is also equipped with an surgical arc, a device that provides real-time X-ray images during the procedure, which is an exclusive resource in Bahia. This technology is primarily applied in complex surgeries in the areas of neurology and orthopedics, where the clinic concentrates its activities.

People often see cigarette remnants on streets, in parks, at bus stops, or in various corners, and usually ignore them, considering them trash. However, some birds, such as sparrows, may collect these discarded cigarette butts in their nests. Although this sounds unusual, scientists have observed such cases and uncovered an interesting reason for this behavior.

According to researchers, some birds might place cigarette butts in nests because the chemical substances they contain can help repel parasites and insects living in the nest. These pests can bother chicks and negatively affect their development. Nevertheless, the full reason for this behavior remains unclear. It should be noted that the toxic components of cigarette butts can be harmful to the birds themselves.

For birds, a nest is not only a place to lay eggs but also a refuge during the early period of the chicks' lives. After hatching, chicks are completely dependent on their parents for some time, needing warmth, food, and protection from external threats. However, various small insects and parasites can develop inside the nest, which can suck the blood of the chicks, damage their skin, and weaken them. Therefore, protecting the nest from these pests is very important for birds.

Some scientific studies have shown that certain species of birds collect tobacco or cigarette waste in their nests. One possible hypothesis is that they use the chemicals contained in these butts to combat parasites. However, this does not mean that all birds behave this way, nor that it is the only reason for finding butts in nests.

Cigarettes contain a chemical substance called nicotine. It is naturally present in the tobacco plant and can affect the nervous system of some insects. Furthermore, cigarette smoke and used filters can contain many other chemical substances. This is why scientists continue to study whether cigarette butts in nests can affect the population of local parasites.

However, it is important to understand here: the effect of any chemical substance on insects and its safety for birds are two different issues. It also cannot be stated that the amount of chemical substances in a cigarette butt is always sufficient to repel insects. Consequently, it is incorrect to say that cigarette butts act as a natural medicine for birds.

Another interesting question is why birds choose specifically cigarette butts. Do they know about the chemical composition of these items, or do they simply use them like other available materials? This is an important question for scientists. Birds use dry grass, leaves, small twigs, feathers, and other handy materials to build nests. Urban birds also find plastic, threads, paper, and other human-discarded trash around them.

Therefore, it is possible that some birds use cigarette butts as one of the available building materials. There is also a possibility that under certain conditions, they are influenced by the chemical properties of these butts. But to prove that birds consciously choose cigarette butts to protect against parasites, additional research into their behavior and nests is necessary.

Although finding cigarette butts in a nest may be interesting for scientists, it does not allow us to conclude that they are beneficial for birds. Cigarette filters usually contain a plastic material called cellulose acetate, which does not easily decompose in the environment. Residues of nicotine and other harmful substances may remain in the filters after use.

If chicks peck at or accidentally swallow these pieces, they can be harmed. Moreover, the chemicals present in the nest can come into contact with eggs and chicks. The fibers used in cigarette filters can also persist in the environment for a long time. Thus, even if there is a possibility that cigarette butts influence insects under certain circumstances, it does not mean that they will generally benefit birds. Their potential advantages and risks must be considered separately.

Human carelessness can pose a threat to birds. Cigarette butts are easily visible on streets, in parks, sewers, and public places in cities. People often consider them insignificant trash, but their environmental impact can last a long time. Birds may take objects nearby into their nests. Under such conditions...

The eyes of insects, octopuses, and vertebrates (including mammals, birds, reptiles, fish, and amphibians) perform the same function—detecting light and forming images—but their structures differ significantly. In humans, they develop during embryogenesis as an outgrowth of brain tissue, whereas in flies and octopuses, they form from the skin of the head.

A new study proposes the following hypothesis: approximately 600 million years ago, one of the ancestors of vertebrates—a worm-like creature—began a sedentary lifestyle, filtering food from the water. In conditions where sharp vision was not required, this animal lost its pair of eyes, which resembled octopus eyes. As a result, it retained only a simple detector on the top of its head, capable of distinguishing day from night or up from down (with less light below).

When the descendants of this worm resumed active swimming, vision once again became critically important. The central detector, which was part of the nervous system, branched out, giving rise to a new pair of eyes—eyes like ours, which project from the brain rather than appearing as skin structures. Furthermore, this central node gave rise to the pineal gland, which produces melatonin—a molecule signaling to the body the onset of night and the need for rest.