The wiring for walking developed long before fish left the sea
Neural circuitry for walking may have evolved in ancient fish as early as 420 million years ago
![skates](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/02/020818_DG_walking-fish_main.jpg?fit=860%2C460&ssl=1)
SKATING AWAY Little skates are cartilaginous fish that use their pelvic fins to amble along the ocean floor.
Jun An-Chen