Arthropods are the most successful animals on Earth - insects, crabs, spiders, lobsters - they’re everywhere.

Reasons for Their Success

• Exoskeleton – Hard chitinous covering protects the body and prevents water loss.
• Jointed appendages – Allow free movement and adaptation to different tasks.
• High adaptability – Can survive in land, water, and air.
• Fast reproduction – Produce large numbers of eggs; short life cycles help in quick evolution.
• Specialized body systems – Efficient sensory organs, compound eyes, wings, and advanced nervous system.
• Occupy all niches – From deserts to oceans, from parasites to pollinators.