There are catbirds here, as in many places in North America. Maybe you have had this experience.
I never see them! Then, a pair showed up to nest in one of the bushes between the little veggie garden and the dahlia garden. Good goobly goop! Continuous, daylong racket! I kinda liked it. BTW, catbird males & females are nearly indistinguishable in appearance, probably behavior as well.
At my home on the river, tiny flycatchers were common. A pair had a nest in a pine tree in my front yard -- right out on the tip of a high branch ... above the driveway ... across from a small open field ... Both parents were there constantly but with hawks, crows, ravens, jays ... I don't know how they get from one generation to the next!
Some birds are very secretive. Hens cackling? Have you noticed ... generally I never did ... that a hen will leave the nest, travel a dozen or so yards, and then begin to cackle? Outdoors, a nest with a dozen eggs and the setting hen may be nearly impossible to find but the hens would sometimes scare the bejeebers outta me by seemingly sneaking right up behind me before beginning their hysterics! Of course, they attract the rooster's attention.
Steve