They will investigate the death of an 8-month-old giraffe at Utah's Hogle Zoo in Salt Lake City, Federal officials have said.

The Salt Lake Tribune reported on Wednesday that the review was prompted by a request by People for the Ethical Treatment of Animals.

Jamar the giraffe was found dead in his enclosure Sunday. Jamar was standing off alone shaking when she saw the calf last on Thursday, Zoo patron Shawna Silva said.

She said "You could see his body trembling. He did not look well."

U. S. agriculture officials are limited to enforcing the Animal Welfare Act and federal regulations do not include specific guidelines for care of giraffes, the Tribune said.

Hogle Zoo passed its three most recent reviews, the newspaper further added.

Federal regulations require zoos to provide protection from inclement weather. Hogle's giraffes are kept indoors during winter but had been outside recently when temperatures warmed.

She was uncertain on Tuesday whether the giraffes were outside during the weekend, when temperatures were below freezing, Zoo spokeswoman Holly Braithwaite told the Tribune.

Zookeepers monitor weather conditions and keep giraffes inside when it isn't safe for them outdoors, she further added. (With Inputs from Agencies)