- The Mahabali frog or purple frog (Nasikabatrachus sahyadrensis) is one of the rare frog species of the Western Ghats. It is named after the mythological king Mahabali.
- It is dark purple to greyish in colour. It is also called pignose frog. It is as old as the dinosaurs.
- It comes out of its burrow for breeding only one day in a year. Its body is bloated which looks jelly like. Its head is very small in proportion to the body.
- It is listed as endangered in the red list of the International Union for Conservation of Nature (IUCN). It can be declared as the official amphibian of Kerala.