A walrus calf found on its own miles from the ocean on Alaska’s North Slope last week that had been receiving cuddles as part of its care after being rescued died on Friday.

“While often rewarding, wildlife rescue is inherently unpredictable and comes with it the possibility of great loss. For those that dedicate their lives to animal care, this is the hardest part of the job,” the Alaska SeaLife Centre, the non-profit research facility and public aquarium that was caring for him, said in a statement online.

A walrus calf found by oil field workers in Alaska about 6.4 kilometres inland. Photo / AP

The Pacific walrus calf, taken in by the center on August 1 after being found by oil field workers a day earlier, was struggling with a number of health issues, such as nutrient malabsorption. In the day before his death, he faced other complications such as hypoglycemia and gastrointestinal problems, the centre said.

“Though our animal care teams worked tirelessly to provide ‘round-the-clock critical care treatments, never leaving his side, the calf ultimately succumbed to his condition,” the centre said. A necropsy is planned.

A walrus calf found by oil field workers in Alaska about 6.4 kilometres inland. Photo / AP

The brown, wrinkly-skinned baby was believed to be about 1 month old. The centre last week said that in an effort to mimic the near-constant care a calf would get from its mom, the walrus was receiving “‘round-the-clock ‘cuddling’” to keep him calm and to aid in his development. The centre described the cuddling as trained staff giving the walrus “the option to have a warm body to lean up against, which he has been taking advantage of almost constantly”.

The range of the Pacific walrus includes the northern Bering and Chukchi seas, but the walruses are occasionally observed in areas like the Beaufort Sea to the northeast, according to the Alaska Department of Fish and Game.

• Rescued walrus calf needs round-the-clock 'cuddling'

The calf was found about four miles (6.4 kilometres) inland from the Beaufort Sea, in Alaska’s extreme north. A “walrus trail”, or track, was seen on the tundra near a road where the walrus was found. But it was unclear how exactly he got there, the centre has said.