AT A GLANCE
- Common Name: Chinese Crocodile Lizard
- Scientific Name: Shinisaurus crocodilurus
- Category: Reptiles
- Subcategory: Lizards
- Range: Southern China (Guangxi and Guangdong provinces) and northern Vietnam (Quang Ninh and Bac Giang provinces)
- Habitat Type: Cool, pristine, shaded montane evergreen broadleaf forest streams, rocky hill brooks, and slow-moving forest pools at elevations between 200 and 1,500 meters
- IUCN Red List Status: Endangered
- Lifespan: 10 to 15 years
- Diet: Carnivorous (freshwater earthworms, freshwater shrimps, aquatic insects, snails, tadpoles, and small fish)
- Average Size/Weight: Total length 35 to 45 cm; snout-vent length 15 to 20 cm; weight 150 to 250 g
- Key Defining Feature: Armored semi-aquatic lizard featuring a muscular tail armed with a double row of crocodile-like jagged ridges, intense orange-red throat markings, and motionless hunting habits
Overview
The Chinese Crocodile Lizard (Shinisaurus crocodilurus) is a rare, ancient, and biologically isolated semi-aquatic reptile native to the pristine, mist-shrouded mountain streams of southern China and northern Vietnam. The sole living member of the family Shinisauridae, this ‘living fossil’ represents a relict evolutionary lineage that diverged tens of millions of years ago. Named for its heavily armored, laterally compressed tail lined with a double keel of raised scales resembling a miniature crocodile, it spends hours perched entirely motionless over forest pools.
Biology and Physical Characteristics
Shinisaurus crocodilurus has a robust head, muscular body, and strong limbs equipped with sharp, curved claws. The back is clad in irregular, keeled scales and granular osteoderm-like skin colored mottled dark olive-brown, greyish-green, or charcoal. The flanks, throat, and belly of mature adults—particularly males—flush with blazing fiery orange, salmon-pink, or scarlet-red coloration during the breeding season. Its most distinctive physical attribute is its long, muscular tail, which is flattened from side to side and topped with two prominent parallel ridges of jagged, raised scales that propel it through swift stream currents with powerful serpentine undulations.
Behavior and Ecology
A true master of stillness, the Chinese Crocodile Lizard is known in local Chinese dialects as the ‘big sleeping snake’ because it can perch completely motionless on low-hanging branches above clear forest pools for hours on end. When a freshwater crab, minnow, or earthworm wanders beneath its perch, the lizard drops explosively into the water, snatches the prey in its powerful jaws, and swallows it whole. If threatened by a predator, it dives to the stream bottom and can remain submerged without breathing for up to 30 minutes, camouflaged amongst submerged granite boulders and sunken leaves.
Conservation and Human Impact
The Chinese Crocodile Lizard is classified as Endangered on the IUCN Red List and is listed on CITES Appendix I. It has suffered catastrophic population declines caused by illegal poaching for the exotic pet trade, electro-fishing, stream pollution, and habitat destruction from small-scale hydropower dams and road construction. Active captive breeding and strict stream sanctuary protection in reserves like Daguishan National Nature Reserve are critical for its survival.
Interesting Factoid
The Chinese Crocodile Lizard is known locally as the ‘sleeping lizard’ because it can sit so completely frozen on a tree branch for an entire day that observers often think it is an inanimate wooden carving.