Serpents are very common, both venomous and non-venomous; the pythons attain a great size.
The main threat is monitor lizards and pythons, neither of which need light to hunt.
The pythons (q.v.) are restricted to the palaeotropical and Australian regions, with the sole exception of Loxocemus bicolor in southern Mexico.
People are breeding and selling potentially dangerous species including anacondas and pythons.
These range from Indian pythons to Vietnamese Golden geckos; from Sudanese plated lizards, to green iguanas.