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to swim tO the surface for
。leep by re8ting One half of
anr.② How do they sleep? 『 Surprisingly, の信4 @
their brain and closing one eye. "These animals sleep for several hours a
day in all.
$@ Migratory birds, such as cranes, also sleep in the same Way as whales
during ther ong fhghts. 9 However, the length of their sleep is not cl
clear.
⑦ Woul Y
ould you hke to sleep and do something at the e time jike
Sa1Im
whales and cranes?
よーンウン
・Oニご p