The world’s largest garden wildlife survey – critical in tracking declining numbers of UK birds– is appealing to volunteers to take part in this month’s event. The RSPB Big Garden Birdwatch provides a snapshot of how the nation’s garden birds are faring in the face of disease, climate change and threats to their habitat. It requires volunteers to watch and count the birds in their nearest open space over the course of an hour during the last weekend of January. Last year over half a million people across the country took part – counting nine million birds. This year’s event marks the 45th year…