Swallows and Leach's Storm Petrels are the successes from St Kilda's bird breeding season this summer, the National Trust for Scotland reports, whilst numbers of puffins have remained the same. For the first time, a pair of migrating swallows have raised three chicks on the Hebridean island of Hirta. The nest was established in a garage operated by defence contractor, Qinetiq, who agreed to leave the doors open for the duration of the breeding season. Swallows are regular summer visitors to St Kilda, but this is the first time that they have successfully raised young. Meanwhile, efforts to monitor the…