I was called a couple of days ago to a Swift nest where the three nestlings were under threat. The only solution I could see was to remove them (legally, I should add) and take them to a carer for handrearing. This is a highly specialised business, but luckily I have a friend, Judith, who is one of the few people in the country with the expertise to do this. I watched as she fed and watered the nestlings, and it was a joy to see.
Shortly afterwards, I received a call from the wife of a fellow Swift enthusiast, to tell me about one of the Swift nests on their house where three nestlings had mysteriously died during the night. And I mean mysteriously, no obvious cause. All I could do, was to make sympathetic noises, but at least I had the consolation of knowing that for the three which died, another three have every chance of making it.
Funny old business, life.