Rosy Boa

L. trivirgata and L. orcutti

Last updated: May 10, 2022
Verified by: AZ Animals Staff
Image Credit reptiles4all/Shutterstock.com

One of the few snakes that naturally comes in a rainbow of colors.

Rosy Boa Scientific Classification

Kingdom
Animalia
Phylum
Chordata
Class
Reptilia
Order
Squamata
Family
Boidae
Genus
Lichanura
Scientific Name
L. trivirgata and L. orcutti

Read our Complete Guide to Classification of Animals.

Rosy Boa Conservation Status

Rosy Boa Locations

Rosy Boa Locations

Rosy Boa Facts

Prey
mice, baby rabbits, kangaroo rats, pack rats, birds, lizards
Main Prey
mice and rats
Name Of Young
neonate
Group Behavior
  • Solitary except during mating season
Fun Fact
One of the few snakes that naturally comes in a rainbow of colors.
Estimated Population Size
Unknown, but over 10,000
Biggest Threat
collectors
Other Name(s)
coastal rosy boa, Mexican rosy boa, Baja rosy boa,
Litter Size
2-15
Lifestyle
  • Nocturnal/Crepuscular
Common Name
Rosy Boa
Number Of Species
2

Rosy Boa Physical Characteristics

Color
  • Brown
  • Grey
  • Black
  • White
  • Cream
  • Orange
  • Chocolate
Skin Type
Scales
Lifespan
18+ years
Age of Sexual Maturity
1-2 years
Venomous
No
Aggression
Low

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The rosy boa is one of two boa species native to areas of California, Arizona, Nevada, and Mexico.

This shy, reclusive species is a popular pet, thanks to its calm temperament and beautiful color choices. It is a smaller cousin to the much larger red tail boa that lives in South America. Like their bigger cousins, rosy boas are nonvenomous constrictors.

Amazing Facts About Rosy Boas

  • This species comes in several color palettes, depending upon which area it inhabits (called a locality).
  • After mating in the spring, females give birth to 2-15 babies after in late Summer or early Fall.
  • Rosy boas’ calm temperament makes them a terrific first snake as a pet, and they’re easy to get from breeders.

Where to find a Rosy Boa

This desert-dwelling boa loves dry, arid conditions like those found in southern California, Arizona, Nevada, and northern Mexico. The rosy boa prefers granite outcroppings, although it also takes advantage of debris left behind by people.

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It’s nocturnal during the hot summer months, but when the weather is cooler in Spring and Fall you might find one wandering about in the late afternoon and early evening. This boa is also found at night crossing roads while on its way to the next rocky crevice for shelter and hunting.

In the spring this species goes looking for a mate. When a female is pregnant, she will carry them for about 5-6 months before giving birth to 5-10 babies in late Summer or early Fall.

This snake is an ambush predator that grabs rodents and small mammals when they get close enough to snatch. After the boa immobilizes the animal, it quickly wraps its coils around it and squeezes until it becomes incapacitated so the snake can swallow it whole.



Rosy Boa’s Scientific Name

Until the early 2000s, scientists recognized one species (Lichanura trivirgata), with four subspecies. They included the desert rosy boa, coastal rosy boa, the Baja rosy boa, and the Mexican rosy boa.

When scientists did more research and genetic testing, they determined that there were two main species and reclassified the northern group into Lichanura orcutti, leaving the southern group in Lichanura trivirgata.

Its genus name, Lichanura, originates in two Greek words: lichanos, forefinger; and oura, the tail. This could be a reference to this snake’s body shape. The specific epithet of trivirgata means three-lined, while orcutti refers to a San Diego naturalist Charles Orcutt, who collected specimens that became the holotype of several species.

Even though the scientists reclassified them into two species, these boas still go by their common names that generally refer to their locality. It makes understanding which type you are looking at a little more difficult, but not impossible.

Rosy Boa Population and Conservation Status

They’re listed in the IUCN Redlist as Least Concern; however, according to the IUCN both Lichanura species’ (rosy boa and three-lined) populations appear to be decreasing. Their actual population size is unknown; scientists believe it may exceed 10,000 adults per species. What scientists do know is that some areas that are easily accessed by collectors have seen a marked decrease in the wild population. In contrast, they’re much more abundant in more remote areas like Organ Pipe Cactus National Monument.

There isn’t as much information on Mexican population numbers, but given that collectors have taken a toll in U.S. areas, it’s likely that this is the case in Mexico.

While this species is lovely to see in the wild, observers should ensure that specimens aren’t removed from the environment. Given that its wild numbers are decreasing and it is widely available from breeders, there’s no reason to be out collecting this snake.

Identifying Rosy Boas: Appearance and Description

Rosy boas have a wide range of colorations but have several things in common. The first is that they stay smaller than most boas; the largest of them won’t exceed 44 inches long. All subspecies have stripes running the length of their body; however, some localities have more definition and contrast in the stripes. For example, the coastal rosy boa has a more speckled appearance, and its stripes aren’t as clearly defined as the Mexican subspecies.

In general, this snake is slow-moving, not at all aggressive, and boasts some of the prettier boa color colors. While they are smaller, like the sand boas, they have a more traditional “boa head” than do the sand boas. Rosy boas have elliptical pupils and eyes that match their body color. Some localities have rose or pink-colored bellies, which is where they get their common name.

This species has a thick, muscular body and smallish head, and most don’t get very bitey, even if you catch it in the wild. That’s not to say that you should capture one and take it home, they’re protected under Federal statute as a species of special concern. This species is popular as a pet and widely available from breeders.

Chocolate colored rosy boa
One of the easiest snakes for beginners with beautiful variety.

reptiles4all/Shutterstock.com

Pictures and Videos of Rosy Boas

Three lined rosy boa
Rosy boas come in a range of colors.

Nathan A Shepard/Shutterstock.com

Slowest Animals In North America
A harmless rosy boa on a granite rock in the desert.

Jason Mintzer/Shutterstock.com

Is a Rosy Boa Dangerous?

Rosy boas are one of the most mild-mannered snakes you can encounter, and even if one does try to bite you, it’s not a venomous species. This snake is not dangerous and is much loved by many field herps.

It is one of the safest snakes to handle, both in captivity and wild. However, it’s a protected species in some places, so it’s best to know your area’s laws.

Rosy Boa Behavior and Humans

Even though they don’t move quickly, rosy boas will attempt to escape before biting. In fact, you’re more likely to have this snake musk you than bite you.

These snakes eat rodents like pack rats, deer mice, kangaroo rats, and baby rabbits; however, they may also eat other animals such as lizards and birds.

Rosy boas are fossorial much of the time and tend towards hiding under things instead of hanging out in the open. This species isn’t known for climbing, but it can climb when the need arises.

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About the Author

Gail is a musician, author, and artist with more ideas than time. She loves learning about all things in the natural world. Her upcoming book, Pebble Worms and Fast Walkers is filled with all the random bits that kids love! She lives in North Texas with her husband, twin sons, dogs, cat, two red-eared sliders, and two ball pythons.

Rosy Boa FAQs (Frequently Asked Questions) 

What do rosy boas eat?

These snakes eat various small mammals including mice, baby rabbits, and kangaroo rats. They also eat birds and lizards.

How do they hunt?

They’re painfully slow, so hunting down their prey probably isn’t easy. They’re ambush predators that wait for their food to come to them.

Are rosy boas dangerous?

No, not at all! This snake is a harmless constrictor whose best defense is to escape or musk you.

How big do they get?

Coastal rosy boas can be up to 44 inches long, but the other species average 2-3 feet long.

Sources
  1. Rosy Boa | IUCN Redlist, Available here: https://www.iucnredlist.org/species/91864513/18977981
  2. Northern Three-lined Boa | IUCN Redlist, Available here: https://www.iucnredlist.org/species/91864677/91864689
  3. HerpWiki, Available here: https://www.herpwiki.com/taxon/lichanura_trivirgata_roseofusca
  4. California Herps, Available here: http://www.californiaherps.com/snakes/pages/l.orcutti.html

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