The most difficult am­phib­ians riddles

The hairy frog, also known as the horror frog or Wolverine frog, is found in Cameroon, Democratic Republic of the Congo, Equatorial Guinea, Gabon, Nigeria, and possibly Angola. Its natural habitats are subtropical or tropical moist lowland forests, rivers, arable land, plantations, and heavily degraded former forest.

The crucifix toad or holy cross frog (Notaden bennettii) is an Australian, fossorial frog. It is one of the few Australian frogs to display aposematism. It is native to western New South Wales, and south western Queensland. The crucifix toad is the most distinctive species of frog within the genus Notaden.

Sirenidae, the sirens, are a family of aquatic salamanders (amphibians). Family members have very small fore limbs and lack hind limbs altogether. In one species, the skeleton in their fore limbs is made of only cartilage. Sirens are found only in the Southeastern United States and northern Mexico.