The tree is in our back garden and used to be a blue cyprus of some sort, but when it grew too big, we had all the foliage cut off by a tree surgeon, and it should eventually die, if it's not dead already. Conifers are like that, whereas many deciduous trees would simply have put out new shoots and carried on growing.
The cat is after a collared dove which is slightly cropped off the top of the picture, and of course, it stands no chance. It's now a good five metres up the tree and the dove (and it's mate which by now has flown away) has been watching it right from the start.
As you'd expect, moments after I took this picture, the dove flew away and the disappointed kitty climbed down.