A subgroup of air-breathing, terrestrial (land) arthropods, spiders are not actually insects but rather belong to the Class Arachnida (a.k.a. arachnid). Besides spiders, other arachnids include ...

Daddy long-legs spiders often appear to walk on six legs, with one pair held aloft. This isn't a defect but a specialized sensory function. These raised legs, packed with receptors, explore the ...