Animals

Animals can be grouped under

• Vertibrates (animal with backbones)
• Invertebrates (animal with no backbone e.g. spiders, prawns...)

Animals can further classify into 7 groups

1. Mammals - e.g. human, dog, cat,
2. Birds - e.g. chicken, bird, eagle,
3. Fish - e.g. shark, crown fish...
4. Reptiles - e.g. crocodile
5. Insects - e.g. grasshopper, butterfly
6. Amphibians - e.g. frogs
7. Arachnids - spiders, scorpions (have 8 legs, exoskeleton)
8. Molluscs - scallop, oyster, cockle (soft-bodied protected inside a shell)
9. Crustacean - lobster, crab, prawn (have 10 legs, protected by shell, breathe through gills or gill chambers, no bones but have a stiff exoskeleton)

Mammals

1. Characteristics
• mammals give birth to young alive (but some lay eggs e.g. platypus, spiny anteater)
• feed their young with the mother's milk
• have 2 pairs of limbs, lungs for breathing
• have hair/fur
• warm-blooded
2. Example of mammals
• On land - human, dog, cat, cow, sheep, tiger, lion...
• In water - whale, dolphine, guppy, swordtail
• Both land and water - seal, walrus