Teaching overview

Learning points

  • Krill gathered in large groups because they were attracted to the nutrients in the meltwater that was flowing off ice sheets.
  • Bigger whales could eat more food than smaller whales and therefore store more energy, allowing them to travel for longer periods.
  • Natural selection is the process by which favourable characteristics become more common over time.

Curriculum keywords

  • Natural selection
  • Adaptation
  • Climate change

Read the story

Scientists think they might finally know why blue whales are just quite so big – it looks like it was all down to climate change.

View the article

Share with students

Spark a discussion

  • Why did the krill feed in large groups?
  • What gave bigger whales an advantage over smaller whales?
  • Can you describe the process of natural selection?

Explore our resources

Complete your lesson with teaching resources on natural selection from Tigtag.

Go to Tigtag

Discover free online CPD for primary science from Reach Out CPD.

Go to Reach Out CPD