Spiders are arachnids, a class of arthropods closely related to scorpions, mites, and ticks. With over 45,000 species, ...

Long before dinosaurs, Earth’s forests were ruled by a many-legged giant. Here’s why this millipede’s size still challenges ...

Introduction -- Insects, spiders, and people -- Scope and arrangement of this guide -- Classification -- What is an insect? -- The body plan of insects and entognaths -- Growth and development of ...

The number of insect species is mind-boggling — and they are a critical part of the environment. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.