Eels cross the Atlantic without eating a single meal
To survive a 4,000-mile journey across the open ocean, these creatures dissolve their own digestive systems and double the size of their eyes to navigate the abyss.
Before embarking on a marathon swim from European rivers back to the Sargasso Sea, the European eel undergoes a radical biological overhaul that defies the typical rules of survival. As they transition into their silver eel stage, their stomachs and intestines physically wither away to make room for massive fat stores. They essentially become living batteries, powering a 7,000-kilometer journey on a single charge. To navigate the crushing depths of the Atlantic, their eyes double in size and shift their sensitivity to detect the faint blue light of the deep ocean, allowing them to travel nearly 1,000 meters below the surface.