Chamaeleo jacksonii (common names Jackson's Chameleon or Three-horned Chameleon) is an African chameleon belonging to the chameleon family with three subspecies.They are native to the humid, cooler regions of Kenya and Tanzania, East Africa, found in great numbers at altitudes over 3,000 m.
These are small to medium sized chameleons. Their adult size is 12 inches in total length. They attain sexual maturity after five months. .Most chameleons are oviparous, but Jackson's Chameleon gives birth to live offspring: 8 to 30 live young are born after a five to six month gestation.
They are sometimes called Three-horned Chameleons because males possess three brown horns: one on the nose and one above each superior orbital ridge above the eyes . The female generally have no horns, or traces of the rostral horn. The colouring is usually bright green, with some individual animals having traces of blue and yellow, but like all chameleons it changes colour quickly depending on mood, health, and temperature.
Source: en.wikipedia.org/wiki/Jackson´s Chameleon - 01.04.2010