Mexican red-knee tarantulas are literally two different species of spider that are native to the Pacific Coast of Mexico. The Brachypelma hamorii and therefore the Brachypelma smithi both have vibrant red "knees" that contrast with their dark body color, making them easy to differentiate from the opposite sorts of tarantulas. And while scientists say there are slight differentiating features between the 2 species-like subtle color and shape nuances-both...