Horned Lizard

Last updated: May 21, 2021
Verified by: AZ Animals Staff

The horned lizards are able to squirt blood from their eyes.



Horned Lizard Scientific Classification

Kingdom
Animalia
Phylum
Chordata
Class
Reptilia
Order
Squamata
Family
Phrynosomatidae
Genus
Phrynosoma

Horned Lizard Conservation Status

Horned Lizard Locations

Horned Lizard Locations

Horned Lizard Facts

Prey
Ants, beetles, spiders, insects, and sometimes pebbles
Name Of Young
Hatchlings
Group Behavior
  • Solitary
Fun Fact
The horned lizards are able to squirt blood from their eyes.
Estimated Population Size
Not known
Biggest Threat
Dogs, wolves, hawks, snakes, roadrunners, pesticides as well as human activities
Most Distinctive Feature
Horns all over their bodies and also the crown of their heads
Other Name(s)
none
Gestation Period
40 days
Litter Size
27 eggs
Habitat
Desert like fine sand areas and dense forest areas.
Predators
Dogs, wolves, hawks, snakes, roadrunners
Diet
Carnivore
Type
Scaled reptiles
Common Name
Horned lizards
Number Of Species
14
Location
primarily North and Central America
Group
Solitary

Horned Lizard Physical Characteristics

Colour
  • Brown
  • Grey
  • Yellow
  • Red
Skin Type
Scales
Lifespan
At least five years
Weight
25-90 grams (1.8-2.5 grams as a yearling)
Height
approximately 3.75 inches
Length
approximately 3.75 inches
Age of Sexual Maturity
13 months

Horned Lizard Images

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Horned lizards, as the name suggests, have a lot of horns all over their bodies. They also have several horns or spikes that sit on the crown of their heads, which is one of their many adaptations for survival.

There are 14 different species of horned lizards that exist around the world. Some of them include the Texas horned lizards, short-horned lizards, desert -, coast -, regal -, and mountain horned lizards. The male lizards are known to vigorously bob their heads at females to call and attract them during the mating season. These lizards are also well-known for squirting blood from their eyes.

5 Interesting Horned Lizard Facts!

Here are a few interesting facts about these lizards:

  • There are 14 types of these lizards in the world. Some of them include the Texas horned lizards, short-horned lizards, desert -, coast -, regal -, and mountain horned lizards.
  • These lizards have horn-like structures all over their bodies, especially their head.
  • These lizards can sometimes camouflage with their backgrounds as one of the adaptations to conceal them from predators.
  • They are known to live in various places – from deserts to dense forests. They require a semi-arid environment to thrive.
  • Most of these lizards live at least for five years.

Horned Lizard Scientific Name

These lizards go by the scientific name Phrynosoma. Their family is called Phrynosomatidae while their order is called scaled reptiles.

The literal translation of “Phrynosoma” is “toad-bodied,” referring to their wide midsection.

Horned Lizard Appearance

There are 14 different types of these lizards including the Texas horned lizards, short-horned lizards, desert -, coast -, regal -, and mountain horned lizards – and while each would have its own specific features, the one thing that remains common in all of them are the horns. These lizards, as the name suggests, are covered in horn-like scales. The largest of the horns usually rest on their heads. While two of them are on their brows, many protrude from their jawline and go up to the skull’s temporal portion.


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Two rows of the horns or spikes run along the lateral portions of their torso and separate the larger spikes on their dorsal side from their scaly underbelly. The snout-vent length of the Texas horned lizards, for instance, measures about 69 mm after they reach sexual maturity, which is around 13 months old.

Female lizards are larger than males. They have short and found bodies. Meanwhile, another type of these lizards – the short-horned lizards are small and flat, and round in shape. They have short horns, as the name suggests, and their bellies are wide like that of the toad.

Giant Hornde Lizard (Phrynosoma asio) warming up on a rock.
Giant Hornde Lizard (Phrynosoma asio) warming up on a rock.

Horned Lizard Behavior

These lizards are solitary creatures and are normally active between 60 to 80 degrees Fahrenheit, which is why they thrive in so many environments across North American and Central America. During summers or otherwise hot days, they are mostly active during the morning hours and become less active during the afternoon. They usually prefer soft, sandy soils near the rocks. This usually allows them to smoothly blend in with the background.

The Texas horned lizards, for, example, can be found lying in open grounds during mornings and evenings. They tend to bask in the sun while hunting for insects. In the hot afternoons, these lizards tend to slide under rocks for shelter. Some of these lizards are also known to go into hibernation from October till late March.

Soon after these lizards come out of hibernation, the mating season takes place. The male lizards call the female lizards by bobbing their heads and signaling for mating.

Horned Lizard Habitat

These lizards are found in the Sonoran Desert region. They are found throughout the area from near sea level up to 11,300 feet or 3340 meters. Some of the species of these lizards like the round-tailed lizard and the Texas horned lizards occur in several US and Mexican states.

Meanwhile, the flat-tailed horned lizard is restricted to Southwestern Arizona, Southeastern California, and a small part of northeastern Baja California. They are also found in the upper neck of the northwestern Sonora region in Mexico, though they can live as far south as Guatemala.

Reports suggest that most of these lizards live in semi-arid environments and deserts where they can often be seen basking in the sun during summer days. These lizards can be found in diverse habitats. Some of them are found in areas of fine sand while the others are found in dense forest areas.

Horned Lizard Diet

While what the specific types of lizards eat can vary, most of them usually feed on various types of ants as well as insects. The short-horned lizard, for example, mainly feeds on harvester ants.

Apart from that, they also eat beetles and spiders, but they will feed on small pebbles occasionally. To trap their unsuspecting prey, the Texas Horned lizards lie motionless while ants cross them. They leap in and capture them as soon as they pass through them.

The neonates, however, eat mostly ants. And the yearlings like beetles while the adult horned lizards feed on both beetles as well as ants.

Horned Lizard Predators and Threats

These lizards face threats from a lot of animals including dogs, wolves, hawks, snakes, and roadrunners. However, predators are not the only thing that poses a threat to these lizards. They usually eat ants that make up most of their diet. Therefore, the pesticides that affect ants also end up affecting these lizards.

Other threats to these lizards include the invasive red ants, illegal pet trade activities as well as climate change, and drought conditions that could impact the lifestyle and habitat ranges of these lizards.

Horned Lizard Reproduction and Life Cycle

Different types of lizards mate in different ways. In the Texas horned lizards, the mating usually happens in April and May, and the eggs are laid in May or June. In these lizards, the female digs a slanting tunnel that is about six inches long. She lays about 27 eggs and places them in three horizontal layers. The layers are separated by firm layers of sand. The eggs are cream in color. They are also very tough and leathery. They hatch in about 40 days.

The round-tailed lizards, however, carry on the process in a much different way. While they also lay eggs, they are known to retain the eggs inside their bodies until the baby lizards are developed. Their eggs are membranous, and the babies break through as soon as the eggs are deposited.

The short-horned lizards, however, are the only type that gives birth to the living baby lizards and not lay eggs just like the several different types of horned lizards. The eggs are retained with the mother until the baby lizards break through, which are ultimately born from the mother.

While little information is available about the lifespan of these lizards, they are known to live at least five years. The males are known to call and attract the female lizards by bobbing their heads and signaling for mating during the mating season.

Horned Lizard Population

While the exact population of these lizards is not known, there are 14 different types of these lizards that exist around the world. However, their population is known to be declining because their diet majorly includes ants, and the pesticides that kill the ants also tend to affect them. Apart from that, human activities like urbanization and pet trading have also affected the populations of these lizards.

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Horned Lizard FAQs (Frequently Asked Questions) 

Is the horned lizard a carnivore, herbivore, or omnivore?

These lizards are mostly omnivorous. They usually eat only ants. Some of the types tend to feed on beetles, spiders as well as insects. Some others also feed on pebbles.

Are horned lizards dangerous?

The horned lizards are harmless to human beings. However, their spikes could be hurtful.

Can you have a horned lizard as a pet?

These lizards do tend to respond well to captivity and do make great pets.

Why do horned lizards squirt blood from their eyes?

Horned lizards squirt blood from their eyes to protect themselves from predators and other threats.

What do horned lizards eat?

These lizards are mostly omnivorous. They usually eat only ants. Some of the types tend to feed on beetles, spiders as well as insects. Some others also feed on pebbles.

Where do horned lizards live?

These lizards can be found in diverse habitats. Some of them are found in areas of fine sand while the others are found in dense forest areas.

How does a horned lizard protect itself?

One of the many adaptations that these lizards possess to protect themselves is the ability to squirt blood from their eyes. They do so by closing off few blood vessels and increasing blood pressure in their heads. This ruptures the capillaries near the corners of their eyes, and they then squirt blood from their eyes.

Sources
  1. Desert Museum, Available here: https://www.desertmuseum.org/books/nhsd_horned_lizard.php
  2. Horned Lizard Conservation Society, Available here: http://www.hornedlizards.org/horned-lizards.html
  3. Washington Nature Mapping Program, Available here: http://naturemappingfoundation.org/natmap/facts/short-horned_lizard_712.html
  4. Wiley Online Library, Available here: https://onlinelibrary.wiley.com/doi/pdf/10.1002/zoo.1430080205

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