Jackson's Chameleon

Fascinating facts about the Jackson's Chameleon

• In 1896 Belgian-British zoologist George Albert Boulenger described Jackson's chameleon and named it after English explorer Frederick John Jackson.
• High up in east African woodlands, this arboreal reptile lives between 1,600 m and 2,440 m altitude where rain tops 127 cm a year and daytime temperatures swing from 16 °C to 27 °C, showing how tightly its life is tied to cool, moist mountain climates.
• Male specimens sport three brown horns, one on the nose and a pair above the eyes, making them look like living versions of the dinosaur Triceratops and giving the genus its name, Tri-oceros, meaning “three horns”.
• Unlike most chameleons, it gives birth to live young: eight to thirty hatch after a five- to six-month gestation, while the dwarf subspecies on Mount Meru delivers five to ten, highlighting a rare reproductive strategy among lizards.
• Since its 1972 introduction to Hawaii, the yellow-crested form has become an invasive predator, swallowing whole native snails and their shells, a silent threat that underlines how a single exotic pet can upset entire island ecosystems.

At a glance

About the Jackson's Chameleon

Jackson's chameleon (Trioceros jacksonii) strides through the mist-laden woodlands of south-central Kenya and northern Tanzania, its three brown horns, one rostral and two preocular, standing like tiny triceratops crowns on the males. The lizard’s skin shimmers bright green, flashing hints of blue and yellow as it reacts to mood, temperature, and health, while a saw-tooth dorsal ridge runs the length of its 15-to-25 cm (6-10 in) body. In the highland forests at 1,600-2,440 m (5,250-8,010 ft), where rain exceeds 127 cm (50 in) annually and day temperatures hover between 16 °C and 27 °C (61-81 °F), these arboreal reptiles glide among branches, their prehensile tails anchoring them as they cruise for insects, centipedes, millipedes, spiders, and even small birds. A surprising trait sets them apart from most chameleons: they are ovoviviparous, giving birth to eight-to-thirty live young after a five- to six-month gestation, a rare strategy among their highland relatives. Their relatively swift sexual maturity at five months and the longer lifespan of males, often outliving females, fuel their capacity to colonize new habitats when introduced, as seen in Hawaii, Florida, and California, where they now thrive in wet, shady niches far below their native altitudes.

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