The average life span is10 ~15 years. Hexagonal arowana is also known as Mexican blunt-mouthed salamander or American salamander. First discovered in Mexico, it has an average life span of10 ~15 years, a body length of 25 ~ 30cm, and a width of about 5cm. It has no scales on its body and black spots on its back. Its limbs are small, but its tail is long. It also has a great feature. Hexagonal arowana is a mature creature of larvae, which means that the posture of Hexagonal arowana is larval all its life. Besides, Hexagonal Arowana is an amphibian. Generally, amphibians need to absorb oxygen in the air in order to maintain the breathing of lungs or skin, so they can't live completely in water, and it takes some time to get to the shore to "breathe". However, the six "horns" of Hexagonal Arowana are the gills it needs to breathe in water, so it can live completely in water.