Reptilia · Squamata
Eremias argusPeters, 1869
Mongolia Racerunner
Photograph by Haplochromis, CC BY-SA, via Wikimedia Commons
A ground-dwelling, day-active, meat-eating lizard from the Palearctic region, reaching 71 mm snout to vent.
Once published as Eremias barbouri — those names reach this page.
Reptilia › Squamata › Lacertidae › Eremias
- Grows to
- 71mm
- greatest recorded
- Eats
- Carnivorous
- Active
- Diurnal
- Lives up to
- 11years
Longer than 58% of all species in Lacertidae anyone has measured.
The bar is the rank itself: its length is the share of the family this animal exceeds. The chart below is the family’s real spread, on a logarithmic scale because body length here runs from 35 to 444 mm. The solid rule is this animal. Every bar is a count of real species, and nothing on this figure is estimated.
What is known
43 sourced facts, each taken from a named scientific dataset. How to read these.
Cited from a dataset unless a row is marked otherwise.
Standing in the world
- Still living
- Extant
- Conservation status
- Least Concern
- Status assessed · the year the Red List last looked
- 2018
- Population trend
- Stable
The animal itself
- Limbs
- Four legs
- Venomous
- No
- Fangs
- None
- Longest recorded life
- 11years
- Preferred body temperature · chosen in a laboratory gradientmeasured
- 35.3–36°C96–97 °F
- Body temperature when active · measured in the wild
- 37.5°C100 °F
- Body temp in the wild · mean, when active
- 37.5°C
Altunisik et al. 2013: 11 for females, 8 for males, Uzum et al. 2014 (max 11)
mean body temperature of active individuals in nature
body temperature of active animals in nature
Size
- Length snout to vent · greatest recorded
- 71mm2.75 in
- Length snout to vent · adult female mean
- 57.3mm2.25 in
- Largest female · snout to vent
- 57.2mm2.25 in
- Hatchling length · snout to vent
- 27.5mm1 in
- Largest juvenile · snout to vent
- 27.5mm1 in
- Body mass · greatestcomputed
- 8.32g0.29 oz
- Body mass at hatchingmeasured
- 0.55g0.02 oz
Buehler et al. 2021 (max 71 mm)
snout-vent length; the source column mixes this with straight carapace length
computed from length by a family-level allometric equation, not weighed
How it lives
- Diet
- Carnivorous
- Active
- Diurnal
- Where it lives
- Terrestrial
- Habitat
- Desert, Forest, Grassland, Rocky, Shrubland, Wetlands
- Biome
- Temperate Broadleaf & Mixed Forests
- Active season · months of the year
- 4–5months
- Region
- Palearctic
- Mainland or island
- Mainland
- Lowest it lives · above sea level
- 70m
- Highest it lives · above sea level
- 2900m
- Range size
- 4,271,363km²
Insects (e.g., Szczerbak 2003, Zeng et al. 2016), arthropods, from metamorph (Dunayev and Orlova 2023)
e.g., Zeng et al. 2016, Buehler et al. 2021, Dunayev and Orlova 2023
Saxicolous / terrestrial (inferred from Dixon 1956 - all specimens on sands), Terrestrial (Wang et al. 2019)
0-2900 (Zhao et al. 1999), 0-2800 (Deme et al. 2022), 600-2050 (Dunayev and Orlova 2023)
Breeding
- Reproduction
- Oviparous
- Average clutch
- 3.25eggs
- Eggs or young per clutch
- 1–6eggs
- Mean clutch
- 3–3.5eggs
- Clutches in a year
- 2.35per year
- Clutches a year
- 1.6–3.1per year
- First breeds at
- 21months
3-4 on average in Wang et al. 2011 Figure 1, 2-6, mean 3.5 (Sun et al. 2012), 2-6 (Szczerbak 2003, Buehler et al. 2021), 2-5 - but means 1.91 to 4.44 so 1 must be possible and 6 likely (Deme et al. 2022), 2-4 sometimes 6 (Dunayev and Orlova 2023), 2-5, means 1.91-4.38 (Deme et al. 2023)
Naming and history
- Suborder
- Sauria
- Infraorder
- Laterata
- Subspecies
- Eremias argus argus PETERS 1869 Eremias argus barbouri SCHMIDT 1925
- Described by
- Peters
- Moved to another genus · since it was first described
- No
- Described in
- 1869
- Type locality
- China
Keeping one
11 in × 11 in × 7 in(28 × 28 × 18 cm)
Minimum length × width × height, for one animal. Bigger is always better.
The standard sizes ground-dwelling species at 4 × 4 × 2.5 times snout-vent length.
Mindestanforderungen an die Haltung von Reptilien (Sachverständigengutachten), German Federal Ministry for Nutrition, Agriculture and Forestry, Animal Welfare Division, 10 January 1997. The standard states these floor areas are recommendations rather than binding limits.
From this animal’s own snout-vent length of 2.75 in (71 mm), at 4 × 4 × 2.5 times it, following the German federal welfare standard — how this is worked out.
In a laboratory thermal gradient this species settled at 96–97 °F (35.3–36 °C).
Preferred body temperature, recorded in a laboratory gradient where the animal could choose freely. A measurement of the animal, not a setting for a thermostat.
Feeding
A prey item should be no wider than the space between the animal's eyes.
Widely used across reptile husbandry references. The stated reason is that the gap approximates the width of the throat, so wider prey is associated with impaction. This is established practice, not a measurement.
1kJ per day
Worked out for an animal of 8 g, the heaviest recorded for Mongolia Racerunner — so it is the top of the range, not a figure for a particular animal. Weigh yours and the number will be lower.
An upper estimate, not a feeding target, and not veterinary advice. The equation covers only what an animal burns staying alive, so a growing, gravid or recovering animal needs more — and it was measured on wild animals, which move far more than one in an enclosure. Body condition and a vet who knows the species are what a feeding decision should rest on. Where this comes from.
What nobody knows
These are not gaps in our research. No scientific dataset records them for this species — and saying so is information you cannot get from a reference that simply leaves a field out.
- — Length snout to vent · adult male mean
- — Length snout to vent · adult mean
- — Length nose to tail · greatest recorded
- — Female length · mean, nose to tail
- — Length nose to tail · adult male mean
- — Length nose to tail · adult mean
- — Largest male · snout to vent
- — Largest female · shell length
- — Largest male · shell length
- — Hatchling length · nose to tail
- — Largest juvenile · shell length
- — Egg length
- — Egg width
- — Body mass · a typical adult
- — Body mass · adult female, mean
- — Eats arthropods
- — Eats vertebrates
- — Eats plant matter
- — How it hunts
- — How the young develop
- — Gestation or incubation
- — Hatchling length · smallest recorded
- — Hatchling length · largest recorded
- — Age at first breeding · female
- — Mature from · youngest recorded
- — Mature by · oldest recorded
- — Size at maturity · smallest recorded
- — Size at maturity · largest recorded
- — Colour on the back
- — Pattern on the back
- — Pupil
- — Sex decided by
- — Red List criteria
- — Density · lowest recorded
- — Density · highest recorded
- — Home range · largest recorded
- — Active in
Others in Lacertidae
Take this data
Everything on this page is available as data under CC BY 4.0 — use it freely, credit it, no permission needed.
This species as JSON · the whole dataset
Cite this page
The Reptile & Amphibian Encyclopedia (2026). Eremias argus. Retrieved 2026-09-08, from https://www.allanglescreatures.com/species/eremias-argus
@misc{eremias_argus_2026,
title = {Eremias argus},
author = {{The Reptile & Amphibian Encyclopedia}},
year = {2026},
url = {https://www.allanglescreatures.com/species/eremias-argus}
}Sources
- Meiri, S. (2024). SquamBase — a database of squamate (Reptilia: Squamata) traits. Global Ecology and Biogeography. Public domain (CC0).
- Oskyrko, O. et al. (2024). ReptTraits: a comprehensive dataset of ecological traits in reptiles. Scientific Data. Used under CC BY 4.0.
- Catalogue of Life (dataset 3LR), used under CC BY.