The Daily Telegraph - 20.08.2019

Weather and crosswords

Tired birds could

be dying for a rest

Tired birds may be risking their lives

for a rest, scientists have discovered.

Birds that are low on fat reserves

nestle their heads under their feathers

for a deep snooze.

This ensures a good nap but slows

down their reaction to the sound of

potential trouble.

The study, which analysed the

sleeping patterns of garden warblers at

a stopover site in the Mediterranean,

found birds that are in better shape

stop and sleep with their heads facing

forward, untucked, and more alert.

Leonida Fusani, of the University of

Vienna and University of Veterinary

Medicine, Austria, said: “We found

that migratory birds trade off safety for

lower energy expenditure.

“If they sleep with their heads

tucked in the scapular feathers, they

enter a deeper sleep that exposes them

to a higher predation risk.”

The study was published in the

journal Current Biolog y.

Nature notes

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34 ***^ Tuesday 20 August 2019 The Daily Telegraph

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