Recent study finds that arachnids demonstrate "genuine cognition."

Ground beetles, such as this false bombardier beetle (Galerita sp.), are happy out in nature, but are just one of hundreds of arthropods that can be found inside a home.

Pictured: a live male specimen of the recently discovered Iandumoema smeagol, foraging in its natural cave habitat.

Opiliones are known by many names, shapes and sizes across the world. The harvestman (Opilion canestrinii) pictured here is typically found in Britain and Central Europe and closely resembles what are known as daddy longlegs in The...