Missing Dallas zoo monkeys recovered but other incidents still a mystery

Other puzzling happenings - a dead vulture, an escaped clouded leopard and a damaged monkey cage - have authorities on edge

A mystery is unfolding at the Dallas zoo as two emperor tamarin monkeys were reported missing on Monday in what is now the fourth recent incident involving animals at the popular attraction in Texas.

Previously a vulture was apparently killed and a clouded leopard escaped after its cage was cut open. Before that another monkey cage was deliberately damaged.