I can not only understand some species of birds, but they can understand me. Developed this habit during the COVID-19 lockdows, and I happen to have blackbirds

I can not only understand some species of birds, but they can understand me. Developed this habit during the COVID-19 lockdows, and I happen to have blackbirds and ducks as neighbours. Was listening to them for some months, and finally decided to chirp in. I don't give them food but they are truly curious of me. The blackbirds stare at me in silence before breaking into the most difficult sequence in their pocket - and laugh at me when I try to versionate. The mature ducks come to me when I say qvuaak, and the chicks when I do the high "blivblivlinli" -sound. I don't feed them or want them to get too attached to humans, but it has been funny experiment.