You should the correct one. If your unsure then leave it unknown. I'm sure it's Barn Swallow. And both do. But as I said look online at the type of nest and you'll know.
More like a Barn Swallow. Nest of Cliff looks more like a gourd and is mostly mud. Barn Swallows is mix of mud, gravel and twigs and is shaped like a half a bowl.
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