These tough trees, hardy in ... distillation of the leaves. Eucalyptus bark, leaves, and oil are considered highly toxic to both humans and most animals. In fact, koala bears—who dine almost ...

Courtesy of Stephen Pincock" />Prepping a koala for a procedure Credit: Courtesy of Stephen Pincock Peering through a fringe of eucalyptus leaves, Don the koala greets visitors with an air of ...