animal deaths

Animal Ark wildlife experts continue to probe the death of a wolf and tiger after receiving toxicology results, which showed traces of two drugs used to euthanize animals and control seizures, on Wednesday morning.

Officials received lab results from the California Animal Health & Food Safety Laboratory System, which came back positive for pentobarbital and phenytoin.

Both are considered barbiturates, a type of depressant drug that causes relaxation and sleepiness, according to the U.S. National Library of Medicine.