X sleeps for 20 h, while Y sleeps for 18 h
X sleeps for 18 h, while Y sleeps for 4 h
X sleeps for 4 h, while Y sleeps for 18 h
X sleeps for 4 h, while Y sleeps for 20 h
In the figures, there is a radius presenting in every 2 hrs. Animal X, sleeps for 2 shaded areas, so it sleeps for 4 hrs, but Animal Y, sleeps for 9 hrs shaded area, so it sleeps for 18 hrs.
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