Cats and prey
Over the years I have been owned by many cats and can say that their behaviour is vary varied and much of it appears to be learned in their youth and their is a fair amount of learning by copying as well as experience.
Unfortunately my wife is very definitely not a cat person and we have a two legged cat predator in this area, who chopped the head off our last cat. Which is a pity because we are plagued with mice in this area.
I have a feeling of gratefulness to my near neighbour who is owned by two cats. They are both mousers, and appeared to have honed the skill to perfection, I hope. They both associate mice with food. I have watched them stalking mice, playing with them (in reality not play but a way of ensuring that they are not bitten by the mice), killing them and then settle down to a fine meal. After eating a mouse they then settle down to a well earned clean, polish and sleep in the sun. These two cats eat the whole mouse, I have been owned by cats that leave the liver.
If a cat has successfully learnt to catch mice and rats (even) they, being creatures of habit, rarely, in my experience, seem to graduate to birds. It is probably only sick, poorly, birds that they go for. Around here (inner London), it seems to me that the greatest amount of predation of small birds comes from Corvids, squirrels and foxes. I have seen Magpies and Crows going through my trees looking for smaller birds nests, and it happens every year. I know when it is happening, the Corvids and the small birds put up one hell of a racket.