Scientists say they have discovered what could be  smallest reptile in  world. It is  kind of chameleon and is  size of  sunflower seed. Chameleons are usually around 35-40cm long. Scientists found two of  tiny lizards - a male and  female - in  mountains in northern Madagascar. They are just 22mm long from nose to tail. The length of the male's body is 13.5mm. At first, the scientists thought the tiny reptiles were juveniles, but later realised they were fully-grown adults. The scientists called  miniature creatures nano-chameleons. The scientists tried to find more of  nano-chameleons, but "despite great effort" could not find any others. 
Madagascar is home to two-thirds of  world's chameleon species. Scientists believe they may have originated there. However, the chameleon's survival is threatened by deforestation on  island. One of the scientists said the nano-chameleons are lucky to survive.  He said: "The nano-chameleon's habitat has unfortunately been subject to deforestation, but  area was placed under protection recently, so  species will survive."  study published by the journal "Nature Climate Change" stated that nearly all of Madagascar's eastern rainforest could disappear by 2070 if deforestation and climate change does not slow down. This would put many of  island's unique species in danger.