Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Scientific researchers have advanced that there are some species of fish which are highly intelligent! More importantly, there are scientists who have brought up evidence showing that fish are even more intelligent than they appear. For instance, they possess cognitive powers which either match or exceed those of higher vertebrates and primates. Yet, there are endless misconceptions about the intelligence of small animals like fish. One of the most common belief is that fish are living automatons which are meant to swim without reason. Consequently, scientific experts have put forward facts showing that fish do possess cognitive abilities which many ignore. Meanwhile, animal behaviorists have mentioned that fish have long-term memory and hardly suffer from short-term memory of memory loss complications as many believed! According to scientific research and findings, fish evolution across centuries have urged their intelligence to develop further and further...