Victims of the Glasgow helicopter crash have been remembered at a service in the city's cathedral, as the rescue and recovery operation continues at the Clutha pub continues.
Scottish Justice Secretary Kenny MacAskill and Deputy First Minister Nicola Sturgeon were among those in attendance.
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Flood warnings and alerts are in place for Scotland and northern England, while high temperatures are set to continue further south.
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Researchers used the method to study why flocks of long-tailed tits segregate themselves into different parts of the landscape.