During last week’s wander around Cardiff Bay and on in to the city I paused for a wonderful 20 minutes to watch the Sand martins flitting constantly in and out of their nests in every available gap, hole and crevice in the walls of the Bay’s many old docks.

Their activity has reached a level of frantic that means I can safely assume they’re now feeding young.

In North America the Sand martin is known as the Bank swallow, something I didn’t know until quite recently when a man tried a little too forcefully to tell me (the term ‘mansplaining’ applies here, I think) that the birds I was watching and listening to were Bank swallows, rather than Sand martins, because that’s what his Merlin bird app told him.

(Note to Merlin users: if you live in the UK, make sure you change your settings to British bird names!)