We are not told how the serpent could talk so we can only speculate, but here are some ideas:
- The serpent is described as being “more crafty than any other beast of the field that the Lord God had made” (Gen 3:1). This may indicate a higher level of intellect than normal animals. So one possibility is that God created the serpent with the ability to speak – an ability that was removed by the curse.
- It is possible that God gave the serpent the power to talk temporarily, like Balaam’s donkey (Num 22:28). Neither snakes nor donkeys have the right vocal chords for human speech, let alone the brain capacity for complex thought, but this would not prevent God making it appear as though the serpent was talking.
- We should also consider the possibilty that Genesis 3 is not a literal account. If this is the case then there is no need to speculate about how the serpent could talk.