Military Ground Snake

Fascinating facts about the Military Ground Snake

• When Carl Linnaeus first catalogued this snake in 1758, he placed it in the genus Coluber. Today it sits in Erythrolamprus, a genus of over 50 species.
• A fully grown adult can stretch to about 50 cm (20 in) in total length, yet its tail makes up only 15.0%–19.8% of that size, averaging 18.6%. This short tail distinguishes it from many other colubrids and hints at a lifestyle geared more toward swimming than climbing.
• Living below 100–700 m (330–2,300 ft) in both lowland rainforests and Atlantic forest streams, the snake thrives in water-rich habitats across South America east of the Andes, from the Guyanas down to Paraguay, illustrating its adaptability to diverse tropical waterways.
• Females of the subspecies merremi and orinus grow larger than the males, and head size stays the same between sexes.
• Two parasites, adult *Ophidascaris* nematodes in the stomach and cystacaths of *Oligatanthorynchus* acanthocephalans in the peritoneum, have been found in the *orinus* and *merremi* subspecies. Their prevalence varies by region but doesn’t affect reproductive output, revealing a surprising resilience to parasitic load.

At a glance

About the Military Ground Snake

The military ground snake, Erythrolamprus miliaris, is a stout-bodied colubrid that prowls the watery margins of South America’s lowland rainforests and Atlantic forest. Adults reach about 50 cm in total length, their tails comprising roughly 18.6 % of that span. Dorsally, the snake wears a pale olive-brown or yellowish coat, each smooth scale edged in black, while its belly is a uniform, bright yellow. Its muscular build and relatively short tail give it a compact silhouette that belies a surprisingly versatile lifestyle. E. miliaris is an aquatic and riparian specialist, thriving at elevations below 100–700 m (330–2,300 ft) where it hunts a diverse menu of amphibian eggs, tadpoles, fish, lizards and small rodents. Though little is known about its feeding rhythms, studies have shown that gravid females with oviductal eggs cease feeding, while those bearing secondary vitellogenic follicles increase their foraging activity. Sexual dimorphism is evident in size: females of the subspecies merremi and orinus are larger than their male counterparts, yet head dimensions remain equal, suggesting diet overlap between the sexes. A surprising twist in its biology is the presence of two distinct parasites, adult Ophidascaris nematodes in the stomach and Oligatanthorynchus acanthocephalan cystacaths in the peritoneum, found in the orinus and merremi subspecies, highlighting a hidden layer of ecological interaction that continues to intrigue herpetologists.

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