Animal kingdom contains six main classes: vertebrates and invertebrates. Animals are grouped based on shared characteristics like appearance and behavior. Classification helps study and understand different animal types
Indian Scolopendra lives in darkness, prefers damp places and burrows. Body is dorsoventrally flattened with red dorsal and yellowish ventral parts. Divided into head and trunk with 24 segments total. Uses powerful legs for zigzag movement
Scute is a bony external plate with horn, found in turtles, crocodilians, and birds. Unlike scales, scutes form in lower vascular layer of skin. Outer keratin layer sheds piecemeal, unlike continuous skin in reptiles. Dermal base may contain bone, forming osteoderms
Invertebrates are animals without a vertebral column. Make up 97% of all animal species. Range in size from 10 μm to 9-10 m. Term "invertebrate" comes from Latin "vertebra" meaning joint
Birth is initiated by hormones causing uterine contractions to expel fetus. Large mammals usually give birth to precocial offspring that can move immediately. Smaller mammals often have multiple births with separate placentas. Human birth has three stages: dilation, delivery, and placenta removal
Comprehensive A-Z list of animals for easy identification. Lists include vertebrates, invertebrates, mammals, birds, reptiles, amphibians. Additional lists cover fish, arthropods, mollusks, and echinoderms