Reptilia · Squamata
Holbrookia maculataGirard, 1851
Lesser Earless Lizard
Photograph by tomas_kay, CC BY, via iNaturalist
A ground-dwelling, day-active, meat-eating lizard from the Nearctic region, reaching 75 mm snout to vent.
Reptilia › Squamata › Phrynosomatidae › Holbrookia
- Grows to
- 75mm
- greatest recorded
- Eats
- Carnivorous
- Active
- Diurnal
- Lives up to
- 5years
Longer than only 33% of all species in Phrynosomatidae 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 47 to 175 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
44 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
- 2007
- Population trend
- Stable
The animal itself
- Limbs
- Four legs
- Venomous
- No
- Fangs
- None
- Longest recorded life
- 5years
- Preferred body temperature · chosen in a laboratory gradientmeasured
- 36.3°C
- Body temperature when active · measured in the wild
- 36.25°C97 °F
- Body temp in the wild · mean, when active
- 33–39.9°C91–104 °F
max 5 (Degenhardt et al. 1996, Heimes 2022), Gutierrez et al. 2013: 4
mean body temperature of active individuals in nature
body temperature of active animals in nature
Size
- Length snout to vent · greatest recorded
- 75mm3 in
- Length snout to vent · adult female mean
- 54.2mm2.25 in
- Largest female · snout to vent
- 54.2mm2.25 in
- Hatchling length · snout to vent
- 21mm0.8 in
- Largest juvenile · snout to vent
- 21mm0.8 in
- Body mass · greatestcomputed
- 14.61g0.52 oz
max 75 (e.g., Heimes 2022)
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
- How it hunts
- Sit and wait
- Active
- Diurnal
- Where it lives
- Terrestrial
- Habitat
- Desert, Grassland, Shrubland
- Biome
- Temperate Grasslands, Savannas & Shrublands
- Active season · months of the year
- 6–7months
- Region
- Nearctic
- Mainland or island
- Mainland
- Highest it lives · above sea level
- 2500m
- Range size
- 1,870,598km²
- Density
- 2.9–34.2per hectare
- Home range · largest recorded
- 1000m2
Arthropods and small lizards (e.g., Barbault and Maury 1981, Stebbins and McGinnis 2018), insects (Heimes 2022)
e.g., Shenbrot et al. 1991, Mesquita et al. 2016, Scales and Butler 2015
e.g., Mesquita et al. 2016, Olberding et al. 2016, Stebbins and McGinnis 2018
0-2130 (Stebbins and McGinnis 2018), 1000-1400 in Mexico (Heimes 2022)
Breeding
- Reproduction
- Oviparous
- Average clutch
- 7.15eggs
- Eggs or young per clutch
- 1–12eggs
- Mean clutch
- 3.5–10.8eggs
- Clutches in a year
- 2per year
- Clutches a year
- 1–3per year
- First breeds at
- 10.3–12months
up to 9 (Lemos-Espinal and Dixon 2013), 8-12, mean 9.7-10.8, Gutierrez et al. 2013: mean 4.5, means 3.5-6.1 (Mesquita et al. 2016), 4-6 (Hibbitts and Hibbitts 2015), 1-12 (Stebbins and McGinnis 2018), mean 4.53 (Dominguez-Guerrero et al. 2022)
Naming and history
- Suborder
- Sauria
- Infraorder
- Pleurodonta
- Subspecies
- Holbrookia maculata bunkeri SMITH 1935 Holbrookia maculata campi SCHMIDT 1921 Holbrookia maculata dickersonae SCHMIDT 1921 Holbrookia maculata flavilenta COPE 1883 Holbrookia maculata maculata GIRARD 1851 Holbrookia maculata perspicua AXTELL 1956 Holbrookia maculata pulchra SCHMIDT 1921 Holbrookia maculata ruthveni SMITH 1943
- Described by
- Girard
- Moved to another genus · since it was first described
- No
- Described in
- 1851
- Type locality
- USA
Keeping one
12 in × 12 in × 7.5 in(30 × 30 × 19 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 3 in (75 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 97 °F (36.3 °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.
2kJ per day
Worked out for an animal of 15 g, the heaviest recorded for Lesser Earless Lizard — 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.
Morphs
1 with peer-reviewed genetics behind them, 0 resting on breeder consensus. Most references present both with the same confidence.
- Adaptive reptile color variation and the evolution of the Mc1r gene. — Evolution 2004
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
- — Body mass at hatching
- — Eats arthropods
- — Eats vertebrates
- — Eats plant matter
- — 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
- — Active in
- — Lowest it lives · above sea level
Others in Phrynosomatidae
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). Holbrookia maculata. Retrieved 2026-09-08, from https://www.allanglescreatures.com/species/holbrookia-maculata
@misc{holbrookia_maculata_2026,
title = {Holbrookia maculata},
author = {{The Reptile & Amphibian Encyclopedia}},
year = {2026},
url = {https://www.allanglescreatures.com/species/holbrookia-maculata}
}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.