Did you know that ... spiders are NOT insects ?!
Watching the latest episode of "The Big Bang Theory" (Season 8 Episode 21 The Communication Deterioration ), Sheldon mentions that "Spiders are not Insects". Honestly I didn't know that, but it's true! As Sheldon says (in his song!) spiders "have two body parts and four pairs of legs" while insects have three body parts and three pairs of legs. From the webpage of the Explorit Science Center of Davis Biologists classify animals and plants according to characteristics that they have in common. Organisms that move from place to place of their own accord and that do not manufacture their food from raw materials in their environment are classified as animals . Organisms that cannot move from place to place of their own accord (but can be moved by forces of nature or by animals) and that can manufacture their own food from raw materials in their environment, are called plants . Within the huge group called animals are many that have no backbon