How to Identify the Radiated Rat Snake (Identification Guide)
A slender Southeast Asian snake identified by distinctive dark stripes radiating outward from the eye across an olive-brown head.
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Key identifying features
The Radiated Rat Snake (Coelognathus radiatus) is a slender to moderately built snake best identified by several dark, thin stripes radiating outward from each eye across the head, resembling sunburst rays, combined with a series of longitudinal dark stripes running along the forebody that often break up into more mottled patterning toward the rear.
Coloration & pattern
The body is typically olive-brown, tan, or grayish-brown, with two or more narrow dark stripes running lengthwise along the front third of the body, gradually fading or transitioning into a more mottled or blotched pattern toward the tail. The head displays the species' signature feature: three or four thin dark lines radiating from the eye toward the jaw, neck, and crown, creating a distinctive sunburst or starburst pattern around the eye that is highly diagnostic.
Head, eyes & scales
The head is moderately elongated with a somewhat squared snout, clearly distinct from the neck. Eyes are large with round pupils, surrounded by the characteristic radiating dark stripes. Scales are smooth, contributing to a sleek overall appearance.
Size & body shape
This is a moderately long, slender-bodied snake with a fairly uniform build along its length, tapering into a moderately long tail, generally built for speed and active foraging rather than bulk.
Range & habitat where you'll see it
Found across Southeast Asia and parts of South Asia, the Radiated Rat Snake inhabits open forests, grassland, agricultural land, and areas near human habitation, and is often active during the day, moving quickly across open ground or through low vegetation in search of prey.
How to tell it apart from look-alikes
The radiating dark stripes fanning out from the eye are the single most reliable and distinctive feature separating this species from other similarly colored olive-brown snakes in its range, most of which lack such a pronounced facial pattern. The combination of anterior body striping fading into more mottled posterior patterning also assists in distinguishing it from ratsnakes with more consistent patterning along their entire length.
Frequently asked questions
What is the key facial feature that identifies the Radiated Rat Snake?
Several thin dark stripes radiating outward from each eye in a sunburst pattern across the head.
Does the body pattern stay the same along its length?
No, dark longitudinal stripes on the front third of the body typically fade into a more mottled or blotched pattern toward the tail.
What is the typical body color of this species?
Olive-brown, tan, or grayish-brown.
Where does the Radiated Rat Snake typically live?
Open forests, grassland, agricultural land, and areas near human habitation across Southeast Asia and parts of South Asia.
Is the Radiated Rat Snake active during the day?
Yes, it is often active during the day, moving quickly across open ground or through low vegetation.