The key spiritual figures in the religion were the Nummo/Nommo twins. According to Ogotemmêli's description of them, the Nummo, whom he also referred to as the Serpent, were amphibians that were often compared to serpents, lizards, chameleons, and occasionally the mammals sloths (because of their being slow moving and having a shapeless neck). They were also described as fish capable of walking on land; while they were on land, the Nummo stood upright on their tails. The Nummos' skin was primarily green, but, like the chameleon, it sometimes changed colours. At times, the skin was said to have all the colours of the rainbow.