Compared with humans, dolphins have a higher IQ than humans. Although dolphins have very developed brains, their IQ is still low compared with human beings. The IQ of an adult dolphin is equivalent to that of a child aged 6-7, but there are more cortex and nerve cells in their brain. Moreover, their brain folds are more developed than those of human beings, but they can't communicate with human beings by language, and they can't think abstractly, so their IQ is still low compared with human beings. Although they have lower IQ than humans, they still have higher IQ than other creatures.

The IQ of dolphins can reach more than 100. Some specialized biologists have studied the IQ of dolphins. It is found that the number of folds and sulci in their brains is relatively large, and their brain weight is similar to that of human beings, which shows that their brains are very developed and their IQ is relatively high. Dolphins' IQ is reflected in many places. For example, after training, they can draw and sing by themselves. In addition, some dolphins will do some simple math problems after training. And they also have their own language system, which is regarded as one of the marine creatures with higher IQ.