Overview
The Leaf-horned Lizard (Ceratophora tennentii), also known as Tennent’s horn-nosed lizard, is a morphologically extraordinary agamid endemic exclusively to the misty Knuckles Mountain Range of Sri Lanka. Named after Sir James Emerson Tennent, this prehistoric-looking reptile is recognized worldwide for the laterally compressed, leaf-like rostral appendage protruding prominently from the tip of its snout, creating exceptional crypsis amidst the moss-laden bark of high-elevation montane forests.
Biology and Physical Characteristics
The defining anatomical feature of Ceratophora tennentii is its prominent, fleshy rostral horn that is laterally flattened and covered in fine scales, mimicking an emerging botanical bud or dried leaf fragment. Both males and females possess this horn, though it is markedly longer and more pronounced in adult males. Their coloration is highly polymorphic and capable of rapid physiological shifts, ranging from olive-green with yellowish-brown dorsal saddles to deep reddish-brown or charcoal when distressed or regulating body temperature.
Behavior and Ecology
Diurnal and largely arboreal, the Leaf-horned Lizard spends the majority of its life clinging motionless to vertical tree trunks and hanging lianas roughly one to three meters above the ground. It is an ambush predator, relying on its uncanny camouflage to remain undetected by avian raptors while scanning the leaf litter below for moving beetles and larvae. When threatened, rather than fleeing rapidly, it presses its body flush against the tree bark or opens its mouth widely to display a vivid orange-red oral mucosa as a startling deimatic display.
Conservation and Human Impact
Evaluated as Endangered by the IUCN, Ceratophora tennentii has suffered profound habitat loss resulting from historical clearing for tea estates and extensive cardamom farming beneath the cloud forest canopy. Although the Knuckles Conservation Forest now enjoys UNESCO World Heritage status, illegal understory clearing, pesticide drift from adjacent agricultural land, and localized bushfires continue to degrade its narrow altitudinal habitat band.
Interesting Factoid
The leaf-like horn on the snout of this lizard is not bone or hard cartilage, but a soft, flexible appendage made of living fleshy tissue that the lizard can subtly manipulate during courtship and territorial displays.
Last updated: October 2026