Barn Swallow (Hirundo rustica)
(June,2013)
When I visited the Urquhart Castle in the Loch Ness I did not see Nessie but I saw many nice castle-resident swallows.
https://en.wikipedia.org/wiki/Barn_swallow

The barn swallow is the most widespread species of swallow in the world. It is a distinctive passerine bird with blue upperparts, a long, deeply forked tail and curved, pointed wings. It is found in Europe, Asia, Africa and the Americas.
Similar species: Perching Birds
By Patomarazul
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Uploaded Jan 24, 2016. Captured in A82, Inverness, Highland IV63 6XL, UK.