There are two sizes. The larger one is heron sized and behaves very much like a heron preferring damp habitats with frogs and so on to scoff. We'd get them as winter visitors in Belgium. Very occasionally we'd see the smaller kind which tend to live with cattle.
Round here they grow Blonds d'Aquitaine and Limousins for beef and there's often a group of the smaller ones in the cattle fields in late summer and autumn. Haven't spotted any this year yet tho they were occasionally seen flying over last winter.