I dont know what the differences are but the correct answer is the Common Swift
I was staying in a house in South Wales towards the end of last summer which had the largest colony of swifts in Wales nesting in the eaves. They were constantly coming and going all day. Until I walked out one morning and they had all gone, every last one of them, only to be immediately replaced by hordes of flies, presumably feasting on a full summers droppings. Isn't nature wonderful.
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I dont know what the differences are but the correct answer is the Common Swift