Rhode Island officials warned an exotic antelope that escaped from a private collection may look like a large deer, but its flesh could be poisonous to humans. The Department of Environmental Management said the 500-pound animal, a nilgai antelope, was shot with a tranquilizer dart just before it escaped from the Hopkinton collection and the chemicals from the dart \"could cause harm or possibly death to people if flesh from this animal is consumed,\" The Boston Globe reported Thursday.