Birds and mammals

In this topic

• The outside and skeleton of a bird
• How a bird breathes, and its heart
• Features of mammals
• Why both groups are warm-blooded

Key terms

• Feather
• Down feather
• Beak
• Air sacs
• Double breathing
• Four-chambered heart
• Warm-blooded
• Fur
• Mammary glands
• Diaphragm
• Differentiated teeth
• Metabolism

Read the full topic

The lesson text, diagrams and 20 test questions are on the site — register free to open them.

UZRU