Summary Unit 4

ANIMALS

Animals can be classified according to different criteria: what they eat, how they reproduce or if they have a skeleton or not.

 

Animals sorted by nutrition:

1. Carnivores: they eat meat (other animals).
2. Herbivores: they eat vegetables.
3. Omnivores: they eat both meat and vegetables.
4. Scavengers: they eat dead animals.
5. Decomposers: they eat decaying plants and meat.

Animals sorted by reproduction:

Viviparous: they grow in the womb before they are born.

mammals

Oviparous: they lay eggs.

• Amphibians
• Reptiles
• Birds
• Insects
• Fish

Animals sorted by skeleton:

Vertebrates: they have spinal cord (backbone with vertebrae)

• Fish
• Mammals
• Reptiles
• Amphibians
• Birds

Invertebrates: they have NO inner skeleton

• Sponges
• Cnidarians
• Worms
• Molluscs
• Arthropods: (they have exoskeleton)