Through this essay Charles Darwin intends to show that there is no fundamental difference between man and higher mammals in their mental faculties . Though the gap in mental power between one of the lowest fishes and one of the higher apes is greater than that between an ape and man, the gap is filled up by gradual process of evolution. Darwin gives many examples and references to prove his thesis. According to him like man even the lower animals feel pleasure and pain, happiness and misery. Young animals such as puppies, kittens, lambs, etc. show emotions and instincts while playing together. Like human children even the insects play together. They ...
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