| # Zoology: The Animal Kingdom | |
| ## 🧬 Classification (Taxonomy) | |
| - **Domain**: Eukaryota | |
| - **Kingdom**: Animalia | |
| - **Phyla**: Chordata (Vertebrates), Arthropoda (Insects/Crustaceans), Mollusca, etc. | |
| ## 🦁 Mammalia | |
| - **Monotremes**: Egg-laying mammals (Platypus). | |
| - **Marsupials**: Pouch-rearing (Kangaroo, Opossum). | |
| - **Placentals**: Internal development (Humans, Lions, Whales). | |
| ## 🦅 Aves (Birds) | |
| - **Evolution**: Modern descendants of theropod dinosaurs. | |
| - **Adaptations**: Hollow bones, feathers, and high-metabolic flight systems. | |
| ## 🦈 Chondrichthyes & Osteichthyes (Fish) | |
| - **Cartilaginous**: Sharks and rays. | |
| - **Bony**: Salmon, tuna, and most reef fish. | |
| ## 🐍 Reptilia & Amphibia | |
| - **Ectotherms**: Regulation of body temperature via external sources. | |
| - **Amphibians**: Dual-life (water-based larvae, terrestrial adults). | |
| ## 🐝 Invertebrates | |
| - **Success**: Arthropods account for over 80% of all described animal species. | |
| - **Roles**: Pollination, decomposition, and foundational food web support. | |