In Wales I became very attuned to the blackbirds' calls. They have different ones for aerial threat and ground threat and I'd find myself checking the gate in case of visitors when I heard one call and checking the skies in case my chickens were at risk when I heard the other.
In Portugal the local blackbirds are even more territorial and complain incessantly when I go out to the garden, insisting that I am the threat and telling me to go away. I scold them back, but they never listen and we generally bicker the whole time I'm out there.