ROOST­ING FACTS

BBC Wildlife Magazine - - Wild December -

Bri­tain’s small­est birdd – the gold­crest, pic­tured right – weighs just 5g and in ex­treme cold can lose a fifth of this overnight. ght. Gold­crests of­ten hud­dle in n a glob­u­lar mass with theirr tails all stick­ing out.

De­spite a hot-tem­pered na­ture, robins will also roost com­mu­nally in ex­treme win­try con­di­tions.

A re­cent study by the BTO and Univer­sity of East Anglia found that Scot­tish wrens are, on av­er­age, larger than those in milder south­ern Bri­tain and bet­ter able to sur­vive overnight frosts.

Treecreep­ers, too, suf­fer greatly in win­ter – but for them, wind and rain are worse than sheer cold. They squeeze into bark crevices for shel­ter.

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