COPENHAGEN, Denmark (AP) — A Danish zoo says a month-old polar bear cub is being raised by humans after his mother failed to produce enough milk to feed him.

Scandinavian Wildlife Park manager Frank Vigh-Larse`n says Siku is doing “really fine.” The cub now weighs 7 pounds (3.2 kilograms grams) — against 3 pounds (1.8 kilograms) at birth.

Vigh-Larsen said Thursday that the cub was two days old when he was removed from his mother after surveillance video inside the bear cave revealed that he “was moaning and being unruly all the time.”

Vigh-Larsen says Siku would have been in danger of death if he had stayed with his mother.

Three people are giving round-the-clock care to the cub at the zoo in Kolind, 105 miles (170 kilometers) northwest of Copenhagen.