How Animals With Exoskeletons Grow and Molt

Next Generation Science

This educational video provides a clear and engaging comparison between vertebrates and invertebrates, with a specific focus on animals possessing exoskeletons. It begins by defining vertebrates as animals with backbones and internal skeletons, illustrating this group with familiar examples like mammals, birds, reptiles, amphibians, and fish. It then shifts focus to the vast majority of animal life—invertebrates—differentiating between soft-bodied creatures and those protected by hard outer coverings. The core of the video explores the structure and function of exoskeletons found in insects, arachnids, and crustaceans. It explains that these outer shells are made of chitin and serve critical roles in protection, movement, shape retention, and water conservation. The narrative highlights a significant biological challenge: exoskeletons do not grow with the animal. This leads to a fascinating explanation of molting, the process by which animals shed their restrictive armor to grow larger, despite the temporary vulnerability it causes. Ideally suited for elementary and middle school science curriculums, this video is an excellent resource for teaching animal classification, structural adaptations, and life cycles. Teachers can use the clear visual examples to help students distinguish between internal and external skeletal systems. The dramatic footage of molting provides a perfect entry point for discussions about growth, vulnerability, and survival strategies in the animal kingdom.