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Le rondini sono già arrivate sulle coste della Gran Bretagna. Lo ha annunciato la Royal Society for the Protection of Birds (RSPB) a fine febbraio, sottolineando che normalmente questi uccelli migratori arrivano sull'isola molto dopo, anche a metà aprile, dopo un viaggio di 10'000 km dall’Africa del sud.
È il clima caldo cui abbiamo assistito in Europa durante questo inverno ad aver sconvolto le abitudini di questo migratore: per la prima volta da quando si registrano le temperature, in Gran Bretagna e Irlanda sono stati infatti raggiunti e superati i 20 gradi centigradi durante un mese invernale.
Molti record son stati battuti nella giornata del 26 febbraio, in mezza Europa: +20,2° nei pressi di Bruxelles, in Belgio; +13,5° nel famoso porto norvegese di Bergen; +22,3°C a Tolosa, in Francia.
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