An eel fossil alongside another fossilized fish. Eels usually live in shallow water and belong to the order Anguilliformes. Some eels live in deep water (4000 meters [13123 feet]).They may vary in size between 10 centimeters (4 in) and 3 meters (9.8 feet) and may weigh up to 65 kilograms (143.3 pounds). This fossilized eel is no different from eels living today. They have not undergone any changes in 95 million years, which proves that these creatures did not go through a process of evolution.