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