2. MAIN CHARACTERISTICS
• They have got a
spinal column or a
internal esqueleton.
• Their bodies are
divided : head ,trunk
and extremities.
• Their nervous system
and sense organs are
very well developed .
3. GROUPS
• Fish
• Amphibians
• Mammals
• Birds
• Reptile
4. FISH
• Body covered with
scales.
• Breathe with gills
• They use their fins to
swim.
5. AMPHIBIANS
• Young are aquatic animals with gills.
• Have got smooth skin and lungs to
breathe air when they become adults.
• Also cutaneous respiration.
• Oviparous animals.
• Most are carnivores.
• Main groups : Frogs and toads –
salamanders and newts.
6. REPTILES
• Have got hard scales and lungs to
breathe air.
• By crawling on four legs .
• Snake are different because they haven´t
got legs .
7. BIRDS
• Birds have got feathers .Have got four
extremities.Two wings and two wings.
• All birds have got lungs.
8. MAMMALS
• Have usually got some hair .
• Have got lots of thick hair called fur.
• Are oviparous
• Are three groups..monotremes,marsupials
and placental mammals.
