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A Dog’s Two Nostrils
Age 10 · Animals
A dog’s nose has two nostrils that work separately. By comparing what each one smells, the dog can tell which side a scent is coming from.
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Age 10: open this week
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In the picture
- The left nostril: it takes in more scent particles when the smell comes from the left
- The right nostril: it takes in fewer particles of the same smell
- The cloud of scent drifting in from the left: its particles reach the two nostrils in different amounts
Examples
- A dog sniffing the ground can tell whether a treat rolled to its left or to its right.
- A dog following a rabbit’s trail keeps its head angled so one nostril catches more of the scent.
Key takeaways
- Each nostril sends its own signal to the brain.
- Comparing the two signals shows the direction the smell comes from.
Quiz: A Dog’s Two Nostrils (Age 10)
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What does a dog compare to tell which side a smell is coming from?
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If a smell comes from the dog’s left, what happens to its nostrils?
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What does each nostril do with the smell it takes in?
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