- Invertebrates are animals that do not have a backbone or spinal column. - They make up the vast majority of animal species on Earth, with estimates ranging from 97% to 99% of all animal species. - Invertebrates can be found in a wide range of habitats, from the depths of the ocean to the highest mountains. - Some common examples of invertebrates include insects, spiders, worms, snails, jellyfish, and crustaceans. - Invertebrates play important roles in ecosystems as pollinators, decomposers, and prey for other animals. - Many invertebrates have complex and fascinating adaptations for survival, such as camouflage, mimicry, and venomous defenses. - Invertebrates are also important for human society, providing resources such as food, medicine, and materials for clothing and construction.