Mexican Red Knee Tarantula: Top 7 Facts!
The Mexican Red Knee Tarantula (Brachypelma hamorii, formerly known as Brachypelma smithi) is a captivating and sought-after species in the pet trade. These spiders are known for their striking appearance, docile temperament, and relatively easy care requirements, making them popular among both novice and experienced arachnid enthusiasts. This article explores seven fascinating facts about these magnificent creatures, providing a comprehensive overview of their biology, behavior, and care.
Appearance and Characteristics of Brachypelma Smithi
The Mexican Red Knee Tarantula is easily recognizable due to its distinctive coloration and physical features. Their bodies are covered in small hairs, or setae, which serve sensory purposes. Understanding their appearance is key to proper identification and appreciation of these spiders.
Identifying Features of the Mexican Red Knee Tarantula

The most prominent feature of the Mexican Red Knee Tarantula is, of course, its red or orange-red markings on the patella (knees) of its legs. The carapace (the upper part of the cephalothorax) is typically a dark brown or black color, contrasting beautifully with the red markings. The abdomen is usually dark brown or black, covered in urticating hairs, which the tarantula can flick off as a defense mechanism. Males and females exhibit some differences in appearance, mainly in size and the presence of tibial hooks in mature males.
Coloration and Markings of Brachypelma Smithi
The coloration of the Mexican Red Knee Tarantula is not just for aesthetics; it also serves as a warning to potential predators. The bright red markings signal the presence of urticating hairs, which can cause skin irritation. The overall dark body coloration helps them camouflage in their natural habitat, blending in with the forest floor. The intensity of the red coloration can vary slightly between individuals, but it is generally consistent and vibrant, especially in healthy, well-fed specimens. The contrast between the red and black makes them visually striking.
Size and Lifespan of the Tarantula
Mexican Red Knee Tarantulas are relatively large spiders. Females are larger than males and can reach a leg span of up to 6 inches (15 cm) or more. The lifespan of these tarantulas is another remarkable characteristic; females can live for 20-30 years or even longer in captivity, while males typically live for 5-10 years. This longevity makes them a long-term commitment for any pet owner.
Habitat and Natural Environment

Understanding the natural habitat of the Mexican Red Knee Tarantula is crucial for providing appropriate care in captivity. Replicating their natural environment as closely as possible ensures the tarantula’s well-being.
Native Habitat of Mexican Red Knee Tarantulas
These tarantulas are native to the Pacific coast of Mexico, specifically in the tropical deciduous forests of the states of Guerrero and Michoacán. They are terrestrial spiders, meaning they live on the ground, often in burrows or under rocks and logs. They prefer drier climates and are well-adapted to surviving periods of drought. They are commonly found in areas with some form of ground cover to provide shelter from the sun and predators.
Environmental Conditions in the Wild
In their natural habitat, Mexican Red Knee Tarantulas experience a range of temperatures and humidity levels. Temperatures can vary depending on the season, but generally range from 70°F to 90°F (21°C to 32°C). Humidity levels are typically moderate, but can increase during the rainy season. The spiders create burrows to regulate their body temperature and provide a stable microclimate. They are most active during the evening and night.
Diet and Feeding Habits

Proper nutrition is essential for the health and longevity of a Mexican Red Knee Tarantula. Their diet in the wild consists primarily of insects and other invertebrates. In captivity, a balanced diet can be easily provided.
What Do Mexican Red Knee Tarantulas Eat?
In the wild, Mexican Red Knee Tarantulas are opportunistic predators, consuming insects such as crickets, grasshoppers, and beetles. They may also prey on small lizards or other invertebrates if the opportunity arises. They are ambush predators, waiting patiently for prey to come within striking distance. Their chelicerae, or fangs, are used to inject venom, which immobilizes the prey and begins the digestion process.
Feeding Frequency and Prey
In captivity, the diet of a Mexican Red Knee Tarantula typically consists of commercially available insects, such as crickets, mealworms, and roaches. The feeding frequency depends on the spider’s age and size, but generally, adults are fed once or twice a week. Spiderlings should be fed more frequently, about every other day. It’s important to provide insects that are appropriately sized for the tarantula, avoiding those that are too large or too small. It’s also crucial to provide a water source.
Behavior and Temperament

The behavior of the Mexican Red Knee Tarantula is an important aspect to understand. They are generally known for being docile and relatively easy to handle, making them a good choice for beginner tarantula owners. However, like any wild animal, they should be handled with respect and care.
Typical Behavior of Brachypelma Smithi
Mexican Red Knee Tarantulas are typically calm and slow-moving. They are often seen sitting in their enclosure, either in their burrow or out in the open. They are not very active hunters and will generally wait for prey to come to them. They are most active during the evening and night. They are not typically aggressive, but they will defend themselves if they feel threatened.
Defensive Mechanisms and Handling
Their primary defense mechanism is the flicking of urticating hairs from their abdomen. These hairs are irritating to the skin and can cause itching and discomfort. Handling should be done with care, and it’s advisable to avoid handling them unnecessarily. If you do handle the tarantula, do so gently and close to the ground to minimize the risk of injury if it falls. Also be sure not to make any sudden movements and try to keep from startling the spider.
Captive Care and Considerations

Providing proper care in captivity is essential to the well-being of a Mexican Red Knee Tarantula. Their needs in terms of enclosure, temperature, humidity, and substrate must be met to ensure their health and longevity.
Setting Up a Suitable Enclosure
A suitable enclosure should be a glass or plastic terrarium of appropriate size. For an adult Mexican Red Knee Tarantula, a 10-gallon tank is a good minimum size, but larger is always better. The enclosure should be well-ventilated, with a secure lid to prevent escape. The substrate should consist of a mixture of coco fiber, peat moss, and vermiculite, which will help to retain humidity and provide a surface for burrowing. Provide a hide, such as a cork bark or a half-log, for the tarantula to retreat to. A shallow water dish should also be available at all times.
Temperature and Humidity Requirements
The ideal temperature range for a Mexican Red Knee Tarantula is 75-85°F (24-29°C). This can usually be maintained with room temperature, but a heat mat can be used if necessary. Humidity should be maintained at around 60-70%, which can be achieved by misting the enclosure with water a few times a week and ensuring the substrate is kept slightly moist but not waterlogged. Monitor the temperature and humidity with a thermometer and hygrometer.
Molting Process and Care

Molting is a natural process where tarantulas shed their exoskeleton to grow. During molting, the tarantula will typically lie on its back. It’s important not to disturb the tarantula during this time. The molting process can take several hours. After molting, the tarantula’s exoskeleton will be soft, and it will take a few days for it to harden. During this period, avoid feeding the tarantula to allow its fangs to harden and prevent any injury.
Reproduction and Breeding
Breeding Mexican Red Knee Tarantulas can be a rewarding experience, but it requires knowledge and patience. Understanding the process, the mating rituals, and the care of spiderlings is essential.
Mating Rituals and Egg Sacs
Breeding involves introducing a mature male to a mature female. The male will typically drum on the ground and perform a mating dance to entice the female. If the female is receptive, she will allow the male to mate. The male will then deposit sperm into the female’s spermathecae. After mating, the female will lay eggs and enclose them in an egg sac made of silk. The egg sac typically contains hundreds of eggs.
Raising Spiderlings
The female will guard the egg sac, and after a period of time, the spiderlings will hatch. The spiderlings are very small and require special care. They should be housed separately in small containers and fed tiny insects, such as fruit flies or pinhead crickets. They grow slowly, and it will take several years for them to reach maturity. Proper ventilation, humidity, and diet are essential during their growth phase.
Conservation Status and Threats
The Mexican Red Knee Tarantula faces several threats in the wild, making conservation efforts crucial to their survival. Understanding these threats and supporting conservation initiatives can help protect these beautiful creatures.
Threats to Mexican Red Knee Tarantulas
The primary threats to the Mexican Red Knee Tarantula include habitat loss due to deforestation, agriculture, and urbanization. The tarantulas are also collected for the pet trade, which can put pressure on wild populations if not managed sustainably. Climate change and environmental changes could also have a detrimental effect on their habitat. The illegal pet trade is also a factor, as some animals are taken from the wild and sold without permits.
Conservation Efforts
Conservation efforts for the Mexican Red Knee Tarantula involve habitat preservation, combating illegal collection and trade, and supporting sustainable breeding programs. Captive breeding can help to reduce the pressure on wild populations. Awareness and education are important components of conservation, encouraging responsible pet ownership and promoting the protection of natural habitats. Supporting organizations involved in conservation efforts can help safeguard these beautiful arachnids for future generations.
Interesting Facts about Brachypelma Smithi
Mexican Red Knee Tarantulas are fascinating creatures. They have a long lifespan, the females of the species can live for up to 30 years. They are generally docile and easy to handle. They are also a popular choice for beginning tarantula keepers. They’re nocturnal hunters, becoming active at night. They molt, shedding their outer layer to grow. They have urticating hairs used for defense. They are native to the Pacific coast of Mexico. They require specific temperature and humidity levels in captivity. They are ambush predators and enjoy eating insects. They can be bred in captivity to reduce pressure on wild populations.
