Sleeping On Migration | Outdoors My Window

Sparrow asleep in New Mexico (photo by Larry Lamsa via Flickr Creative Commons license)

31 August 2023

Migration is exhausting work and since warblers migrate at evening, they need to relaxation and refuel throughout the day. Meals and good cowl are each important at their relaxation stops. Sleeping is a harmful exercise the place predators lurk.

A research printed in Current Biology, August 2019, revealed a technique that migrating warblers handle these risks and calls for: They regulate their sleep postures relying on their bodily situation and physiological wants. Plump, well-muscled birds are inclined to sleep with their heads held upright, whereas scrawnier warblers tuck their heads into their feathers, a posture that makes them extra susceptible to predation however helps them preserve their a lot wanted power.

New York Times: Some Migratory Birds Sleep Better Than Others, August 2019

Match warblers can afford to be vigilant. They puff up and sleep in a watchful posture, generally out within the open. This makes them prepared to flee at a second’s discover.

Sardinian warbler asleep on a branch (photo from Wikimedia Commons)

Exhausted warblers conceal in thickets and tuck their heads underneath their wings. This supplies a lot wanted relaxation and protects towards warmth loss however makes them susceptible to predators. Apparently, these same birds sleep less than those in good condition because they have to spend more time foraging.

Bird sleeping with head tucked under wing (photo from Wikimedia Commons)

Some lengthy distance migrants, such because the ocean-going nice frigatebird, can sleep in flight.

Great frigatebird in flight (photo from Wikimedia Commons)

A 2016 research geared up nice frigatebirds (Fregata minor) with EEG gear and proved that they sleep whereas flying although they get much less sleep within the air than on land. Learn extra on this classic article.

It will be good to securely sleep whereas doing different issues. Yawn! I’m prepared proper now.

(pictures from Wikimedia Commons, see hyperlinks within the captions)

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