Page 31 - It Can't Be True! Animals! - Unbelievable Facts About Amazing Animals (DK)

SKILLS AND SENSES 31

Sperm
whales can
sleep upright
at depths of
10 m (33 ft)
beneath the
surface.

Small pods of about
five sperm whales
come together for
these short rests.

FAST FACTS

The koala dozes for
15 hours a day. Its
low-energy, leafy
diet only enables
it to be active
for a few hours
each day.

Walruses can sleep in
water by resting their
head on floating
ice or by filling
their throat with
air to keep
them afloat.

Ostriches remain
alert to danger by
sleeping for only short
spells and standing
up for these naps,
ready to run away
from predators.

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