Which country owns the Hen and Chicken islands

New Zealand
The Hen and Chicken Islands (usually known collectively as the Hen and Chickens) lie to the east of the North Auckland Peninsula off the coast of northern New Zealand.

They lie 12 kilometres (7.5 mi) east of Bream Head and 40 kilometres (25 mi) south-east of Whangarei.

Read more...https://en.wikipedia.org/wiki/Hen_and_Chicken_Islands