Well mostly but
Very good…
I’ve had a nest that they return to breed in every year without fail since 1985
Some years they are late, and I always get a sad sinking feeling when they (my summer airshow) leave.
Swallows undertake an impressive 6000 mile migration between the UK and South Africa twice a year in search of food.
www.discoverwildlife.com/animal-facts/birds/facts-about-swallows/