How a dolphin rests one brain hemisphere at a time
An A2 reading about dolphin unihemispheric sleep and a bounded echolocation experiment.
Un delfín ha dormido sin dejar de escuchar
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About this article
Level A2 Reading focus
What you'll learn
Present perfect with the irregular participles hecho and visto, plus alguna vez and ya.
A dialogue and diagram explain how a dolphin combines rest in one hemisphere with breathing and attention.
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