Sounds like a heron - not exactly a songbird
They frequently inhabit holes in rotten trees or in rotten branches of large trees. I think that is their preferred habitat.
They make nests in large, dead trees.
Ireland has lots of trees, because it has the kind of environment that can support them. At one time very large areas of Ireland were covered in trees. There is still a lot of forest in Ireland.
Rooks often nest in trees: you can frequently see large numbers of nests together (a rookery). In fact, you might hear them before you see them!
oak trees
they sleep in nests on tall mountains or nests in trees.
Gorillas and Chimpanzees build nests occasionally in trees. Orangutans build nests exclusively in trees and so do Ruffed Lemurs.
Trees. Squirrels live in nests in trees.
In trees and nests
in trees
On tall trees
trees