A tiny reed warbler feeds an enormous cuckoo chick, thinking it is one of its own babies. The family was captured on camera by wildlife photographer David Tipling near Thetford, Norfolk. He said: "Cuckoos have the ability to lay eggs that closely resemble the coloration of other birds. Once this young cuckoo hatched he would have pushed the other eggs out of the nest and started demanding food. These reed warblers appeared to think the chick was their own - it was just their instinct to look feed it. The cuckoo was three times the size of them but they didn't seem to notice."