Three endangered tigers have celebrated their first birthday with a rummage through a pile of cardboard boxes.

Nova, Nadirah and Naresh have turned one and Kasha Carter, head of carnivores at West Midlands Safari Park, said: “As we all know cats love boxes, so we thought we would treat them to a massive stack of them.”

The Sumatran tiger cubs were born as part of a European breeding programme, and the International Union for the Conservation of Nature (IUCN) believes there may be just 400 of their species left in the wild.

They are said to be close to extinction because of habitat loss, conflict with humans and poaching for the illegal trade in tiger body parts.