So that we don’t impair the birds’ flight, we have utilised small satellite tags that are dependent on solar charging to replenish their batteries. Consequently, low light levels caused some gaps in data transmission in winter, but we have been able to capture locations accurate to between 150 metres and one kilometre.
In tracking these enigmatic waders, we are able to gain a better understanding of the 750,000-1,200,000 migrants which join the considerably smaller resident population in Britain in winter.
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