Grammostola is a genus of South American tarantulas that was first described in text by Eugène Louis Simon in 1892. These medium- to large-sized spiders are native to tropical South America, and are usually brown in color, with pinkish or orangish-red hairs. The very docile Chilean rose tarantulas (Grammostola rosea and Grammostola porteri) are popular as a beginner's spider among tarantula enthusiasts.