Colombian Giant Red Leg Tarantula (Megaphobema robustum) Care Guide

The Colombian Giant Red Leg Tarantula, Megaphobema robustum, is one of South America's most recognizable terrestrial tarantulas. With its impressive size, thickly built body, and vibrant reddish-orange legs, this species commands attention wherever it is found. Yet what truly sets it apart is not its appearance, but its unusual defensive behavior. Rather than relying solely on fangs or urticating hairs, Megaphobema species are famous for spinning around and kicking with their powerful rear legs when threatened.

Native to Colombia's humid mountain forests, this tarantula has evolved in an environment shaped by steep terrain, persistent rainfall, and dense vegetation. For keepers interested in large terrestrial tarantulas with fascinating behavior and striking coloration, the Colombian Giant Red Leg remains one of the hobby's most rewarding species.

Species Overview

Common Name: Colombian Giant Red Leg Tarantula
Scientific Name: Megaphobema robustum
Type: New World Terrestrial Tarantula
Origin: Colombia
Adult Leg Span: 6–8 inches (15–20 cm)
Growth Rate: Moderate
Temperament: Defensive but generally reclusive
Lifespan: Females 15–20+ years, males 4–6 years
Experience Level: Intermediate

A Tarantula from Colombia's Cloud Forest Region

Much of Colombia's reputation for biodiversity comes from the Andes Mountains, which split into multiple ranges as they move north through the country. Between these mountains are deep valleys, river systems, and vast expanses of tropical forest. In many areas, warm lowlands transition into cooler cloud forests where moisture from the Caribbean and Pacific condenses against mountain slopes.

These cloud forests are among the most biologically diverse ecosystems on Earth. Moss-covered trees, ferns, bromeliads, and countless species of insects thrive in the nearly constant humidity. Thick layers of leaf litter accumulate across the forest floor, creating ideal conditions for burrowing tarantulas.

Within these forests, Megaphobema robustum spends much of its life hidden beneath roots, fallen logs, and natural underground retreats. The stable temperatures and abundant prey make these mountain forests perfectly suited for a large terrestrial predator.

Appearance

Few terrestrial tarantulas possess the visual impact of an adult Colombian Giant Red Leg.

The body is typically dark brown to black, creating a dramatic contrast against the reddish-orange coloration found on portions of the legs. Mature females develop a heavy-bodied appearance with substantial leg thickness and impressive overall mass.

The species is often confused with its close relative Megaphobema mesomelas, but M. robustum remains one of the most recognizable members of the genus due to its combination of size and coloration.

Juveniles are often less colorful and develop stronger contrast as they mature.

The Famous Defensive "Spin"

The behavior of Megaphobema robustum is one reason the species has become so well known among tarantula enthusiasts.

When threatened, many tarantulas either retreat, kick urticating hairs, or display a threat posture. Megaphobema often takes a different approach. Individuals may rapidly turn away from the perceived threat and strike backward with their rear legs.

These powerful kicks are intended to discourage predators and can be surprisingly fast.

Fortunately, most captive specimens prefer retreat over confrontation and spend much of their time hidden within their burrows.

Enclosure Setup

The Colombian Giant Red Leg is a terrestrial species that appreciates floor space and deep substrate.

Recommended enclosure features include:

• Wide terrestrial enclosure

• 6–10 inches of substrate

• Cork bark hide or natural retreat

• Moderate ventilation

• Water dish

• Stable humidity

Unlike arboreal species, vertical height is far less important than providing adequate burrowing opportunities.

Many specimens will excavate extensive tunnels beneath their hide and spend significant time underground.

Substrate

Deep substrate is one of the most important husbandry requirements for this species.

A mixture capable of retaining moisture while remaining structurally stable works best. The goal is to provide conditions that encourage natural digging behavior while maintaining humidity in lower layers.

A substrate depth of at least 6 inches is recommended for larger juveniles and adults.

For keepers creating naturalistic enclosures, Vivarium Naturals Arachno Thrive Tarantula Burrowing Substrate provides excellent structure for burrowing species such as Megaphobema robustum. Some hobbyists also incorporate Vivarium grade Sphagnum Moss in select areas to help stabilize humidity levels, particularly during drier seasons.

Temperature and Humidity

The cloud forests of Colombia remain relatively stable throughout the year, and captive husbandry should reflect those conditions.

Temperature: 72–80°F (22–27°C)

Humidity: 70–85%

Rather than keeping the enclosure wet, focus on maintaining slightly moist lower substrate layers while allowing portions of the surface to dry between waterings.

Good ventilation remains important despite the species' preference for higher humidity.

Feeding

The Colombian Giant Red Leg is an opportunistic predator that readily accepts a variety of feeder insects.

Suitable prey items include:

• Crickets

• Dubia roaches

• Red runner roaches

• Mealworms

• Superworms

Adults generally require feeding every one to two weeks, while juveniles can be fed more frequently to support growth.

Many specimens display enthusiastic feeding responses despite their generally secretive nature.

Growth Rate

Megaphobema robustum grows at a moderate pace compared to many popular tarantulas.

Spiderlings establish slowly during their earliest stages but gradually gain size and confidence as they mature. Females continue growing for many years and often develop into impressively large adults with substantial body mass.

Because of their long lifespan, mature females can remain a centerpiece species for well over a decade.

Molting and Burrowing Behavior

One characteristic that occasionally concerns new keepers is how much time this species spends hidden.

Prior to molting, individuals often seal themselves within their burrows for extended periods. Weeks or even months of reduced activity are not uncommon.

Patience is important.

Disturbing a tarantula during this process can create unnecessary stress and increase the risk of injury.

Is the Colombian Giant Red Leg Tarantula Right for You?

For keepers who enjoy seeing their tarantulas constantly on display, Megaphobema robustum may not always be the ideal choice. Much of its life is spent hidden beneath the surface, emerging primarily after dark.

However, those who appreciate natural behavior, impressive size, and unusual defensive displays often consider this species one of the most rewarding terrestrial tarantulas for sale and available in the trade.

Its combination of vibrant coloration, fascinating natural history, and unique behavior makes the Colombian Giant Red Leg a standout representative of Colombia's extraordinary cloud forest ecosystems.