Theraphosa stirmi

Theraphosa stirmi is the third giant. Where Theraphosa blondi made the name and Theraphosa apophysis carved out the niche, Theraphosa stirmi sits beside them as the quieter member of a trilogy that defines the outer limit of tarantula scale. Adult females are heavy-bodied and dark, softened by a covering of ruddy setae that catches the light like weathered mahogany. Less talked about than its famous cousin, Theraphosa stirmi matches it pound for pound in sheer physical presence — and for many keepers, edges ahead on temperament.

For a Theraphosa, it leans toward the calm end of the spectrum, spending most of its time in slow, deliberate movement across the substrate rather than throwing threat postures. It is a committed terrestrial — burrowing, rearranging, claiming its enclosure with the quiet authority of an animal built to own the forest floor. The urticating setae, however, are among the most intensely irritating produced by any New World tarantula. Skin contact causes significant discomfort, and airborne setae pose a genuine risk of respiratory irritation and eye injury. This is not an animal to be handled, and not one to work with in a poorly ventilated room without eye protection. Appetite matches frame: substantial and consistent.

The enclosure has to reflect the species' scale and origin. A generous footprint, coconut fibre substrate at 7–10 cm depth, a robust hide and a large water dish form the foundation. Humidity should run on the higher side, maintained through regular misting, with cross-ventilation to keep the air moving rather than stagnant. Room temperature suits this species, which simplifies long-term care considerably.

Theraphosa stirmi makes sense for one kind of keeper in particular: the one building a complete picture of what the genus actually is. Owners of Theraphosa blondi or Theraphosa apophysis will find that adding Theraphosa stirmi doesn't just round out a shelf — it reframes the other two, revealing another angle of what these animals are at their most elemental. Years in, it tends to become the spider visitors are taken to see first, and the one the keeper stands in front of longest.