BUN
When it comes to sleeping, we probably picture a nice comfortable bed. We imagine
laying our heads on big fluffy pillows and lying under nice warm blankets. Most animals,
1., sleep in very different places. Sea otters, for instance, sleep on their backs in the
water and 2.don't drown. When giraffes get their forty winks, they are able 3.
their hips as a pillow. And some creatures, like the Alpine swift, can even doze off
they are flying up in the sky!
These 5.
shost
4.
a
S
migratory birds travel thousands of kilometers between continents
weeks or even
every year. On these extremely long flights, they stay in the sky 6.
months at a time. In fact, one Swiss study in 2013 showed that Alpine swifts remain in th
air for even longer than we imagine. In this study, special sensors were attached to six bird
so that their location and speed could
7. at all times. The research team found th
landing!
the swifts could cover up to 10,000 km and go as long as 200 days
AW
Wolne
8.
7
