Description
They are sometimes called Three-horned Chameleons because males possess three brown horns: one on the nose (the rostral horn) and one above each superior orbital ridge above the eyes (preocular horns), somewhat reminiscent of the ceratopsid dinosaur genus Triceratops. The female generally have no horns, or traces of the rostral horn (in the subspecies jacksonii and merumontanus). The coloring is usually bright green, with some individual animals having traces of blue and yellow, but like all chameleons it changes color quickly depending on mood, health, and temperature.
These are small to medium sized chameleons. Their adult size is 12 inches (30 cm) in total length. They have a saw-tooth shaped dorsal ridge. There is no gullar crest. They attain sexual maturity after five months. The lifespan is variable, with males generally living longer than females.
Jackson's chameleons live primarily on a diet of small insects. They are less territorial than most species of chameleons. Males will generally assert dominance over each other through color displays and posturing in an attempt to secure mating rights, but usually not to the point of physical fights.
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