The largest phylum is Arthropoda. These animals are everywhere - on land, in water, and in air. Their hard exoskeleton, jointed legs, and ability to adapt make them so successful.

Key Points

• Largest phylum = Arthropoda.
• About 80% of animal species.
• Examples: Insects, crabs, spiders, scorpions, lobsters.
• Features: Exoskeleton, jointed legs, segmented body.