Science behind Ganesha| Secret of Lord Ganesha

First transplanting:

According to mythology, the transplantation of head from elephant to human is considered as a first ever transplanting. Even though it's still seem to be a mystery, let's see a science behind this transplant. Because of his anger, Shiva choped the head of his son, Ganesha. After hearing this, his wife Parvathy got angry. To control her anger, Shiva asked his fellowmen to bring some head for transplant. They searched all around and bring an elephant for transplanting head but not fish, birds. Why?

                                                                               We already know that our ancient Indians had a great knowledge of surgery from the books of Sushruta. This is because elephant is a mammal. Every mammal has something similar in body parts. So, it does match with human. But it is not matched for fish or birds because they are not mammals.