The dusky tetraka, last seen by scientists in 1999, was spotted hopping around the dense forest undergrowth.
Size apparently does matter for male Brookesia nana chameleons.
The 19-year-old had recently finished a research trip in the remote area of Anjajavy.
Alana Cutland's family say she had become unwell, possibly due to prescription medication.
The Cambridge University student fell 1,130 metres onto a plain of carnivorous big cats.
The body of the 19-year-old from Milton Keynes has yet to be found.