This can be likened to the scriptures where we get to see that the snake is the animal that the devil took its form when the disobedient that happened in the garden of Eden which included Adam and Eve. The Bible took time to narrate how the snake (devil) convinced and deceived Eve that there is nothing wrong in eating that fruit which they say that it is forbidden by God. The way that the snake even assured Eve that once she takes the fruit and convinces Adam to do likewise, that they will get to understand the right from the wrong, the bad from the good and all that. The scripture also went further to narrate how God got to know that Adam and his wife, Eve, has disobeyed him and how they were chased from garden. So, when we read that part of the Bible, we get to see the reason snakes are always seen as one of the worst animals that we have on earth.