It is not accurate to claim that most mammals have evolved a higher level of intelligence than birds.

Ravens and crows are commonly recognized for their intelligence. They have demonstrated problem-solving abilities and cognitive skills, as shown in videos like the ones provided.

Parrots are also known for their intelligence. Alex, a famous parrot, was able to learn and comprehend English to a remarkable extent, surpassing the language capabilities of most mammals.

Many people are unaware that numerous bird species, including smaller ones, have impressive cognitive abilities. For example, they can memorize the locations of numerous cached food items, a task that is challenging for humans. Bird behavior is often complex, involving elaborate courtship rituals, intricate songs, and intricate parenting behaviors. They also exhibit remarkable feats of aerial navigation during migration, traveling long distances. Finding food can be equally challenging for birds, if not more so, due to their high metabolic rates. Furthermore, many bird species have longer lifespans compared to mammals of similar size, allowing for extensive learning opportunities.

Although bird brains are relatively small, this is primarily due to their smaller body sizes. Birds need to minimize the weight and size of their organs, including the brain, to facilitate flight, which is energetically demanding. However, birds compensate for their small brain size by having small neurons. In fact, when counting neurons, birds have numbers comparable to primates in their forebrains.

From a scientific standpoint, it is more appropriate to ask why there are fewer intelligent mammals compared to the abundance of intelligent birds.

Mammals and birds generally exhibit higher intelligence compared to cold-blooded animals. A chart depicting the relationship between body size and brain size across various animals reveals that cold-blooded animals consistently have smaller brains than warm-blooded ones, as represented by the open circles in the chart.

Cold-blooded animals have adapted to survive on minimal amounts of food. Anyone who has kept pet goldfish or turtles can attest to their low dietary requirements. Brains consume a significant amount of energy, and larger brains would necessitate cold-blooded animals to consume significantly more food.