The species on earth that has the highest IQ is us humans, followed by chimpanzees.
Chimpanzees which are closely related to humans are the animals that have the second highest intelligence aside from humans.
Chimpanzees also share almost 99 percent of human DNA and they also use and modify tools and they show complex social interactions and are also capable of empathy.
Chimpanzees can also solve problems as well as learn through observation and imitation and they can also recognize themselves in mirrors.
Humans also have larger brains than chimpanzees.
A human brain is significantly larger than the brains of chimpanzees and are roughly 3 times the size of chimpanzee brains.
The average human brain is around 1330 cc cubic centimeters in size and the average chimpanzee brain size is around 405 cc.
Humans and chimpanzees also share a similar basic brain structure, but humans have a much larger cerebral cortex, most particularly the association cortex, which is what plays a key role in higher level cognitive functions like awareness, attention and memory.
This dramatic increase in brain size in the human lineage is also a major factor in the evolution of human cognitive abilities and human intelligence.
Human brains also have a greater number of neurons, especially in the brains prefrontal cortex, which is also associated with planning, social behavior and complex thinking.
The closest relative to humans are bonobos and chimpanzees which share roughly 99 percent of human DNA.
Chimpanzees and bonobos are considered to be the closest relative to humans due to their shared ancestry with us humans, which also branched off from a common ancestor roughly 6 million to 8 million years ago.
Humans evolved and came into existence by evolving from apelike ancestors and most specifically, the lineage that lead to modern humans called Homo Sapiens which is what we modern humans are.
Homo Sapiens which is what us modern humans are diverged from the line which led to chimpanzees and bonobos about 6 million to 7 million years ago.
The divergence of humans marked the beginning of the hominin evolution, with early members of the hominin line exhibiting traits such as bipedalism, which is walking upright as well as smaller canine teeth.
And over millions of years, the early hominins evolved into various species, including different types of australopithecines and eventually the genus Homo, which also includes the species such as Homo neanderthalensis and Homo erectus and ultimately modern humans which is what we are Homo sapiens.