How to Identify the Tiger Keelback (Identification Guide)
A boldly patterned East Asian snake with alternating black, yellow, and orange-red markings resembling tiger stripes, most vivid on the neck.
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Key identifying features
The tiger keelback (Rhabdophis tigrinus) is identified by its striking pattern of alternating black, yellow-green, and orange-red blotches or bars, most vividly expressed on the neck and front third of the body, giving a tiger-striped appearance. This bold, high-contrast coloration combined with strongly keeled scales is the primary identifying feature.
Coloration & pattern
The body ground color is olive-green to yellowish-green, overlaid with black crossbars or blotches, and vivid orange to red patches concentrated near the neck and front portion of the body, which fade or become less distinct toward the tail. The overall effect resembles bold striping or banding reminiscent of a tiger's coat, though pattern intensity varies regionally and individually.
Head, eyes & scales
The head is moderately distinct from the neck, olive to greenish with darker mottling. Behind the head, some individuals show enlarged glands (nuchal glands) that can appear as a subtle swelling, an unusual feature linked to this species' unique defense chemistry. Eyes are moderate with round pupils. Scales are strongly keeled, giving a rough, ridged texture.
Size & body shape
Adults typically reach 60 to 100 cm (24 to 39 inches), with a moderately slender to medium body build and a tail of moderate length.
Range & habitat where you'll see it
The tiger keelback is found in East Asia, including Japan, Korea, and parts of China and Russia's Far East, inhabiting rice paddies, wetlands, grasslands, and areas near ponds and streams. It is diurnal and frequently encountered near water, where it feeds heavily on frogs and toads, and is one of the more commonly seen snakes in agricultural landscapes within its range.
How to tell it apart from look-alikes
Other keelback species, such as the red-necked keelback, show red coloration concentrated as a neck patch rather than extended tiger-like banding along the front body. Ratsnakes and other colubrids in the same region lack both the vivid orange-black patterning and the strongly keeled scales. The distinctive tiger-like black, yellow-green, and orange-red patterning concentrated toward the front of the body, combined with rough keeled scales, distinguishes this species from regional look-alikes.
Frequently asked questions
What gives the tiger keelback its name?
Its bold pattern of alternating black, yellow-green, and orange-red markings, most vivid near the neck, resembling tiger stripes.
Is the tiger keelback venomous?
Yes, it is a rear-fanged species capable of producing medically significant venom and possesses additional defensive glands on the neck; it should never be handled.
Where is the tiger keelback found?
In East Asia, including Japan, Korea, and parts of China and Russia's Far East, especially near rice paddies and wetlands.
What does the tiger keelback eat?
Mainly frogs and toads, hunted in and around wetland and agricultural habitats.
How does its pattern change along the body?
The bold black, yellow-green, and orange-red patterning is most vivid near the head and neck and becomes less distinct toward the tail.