A beloved member of the Philadelphia Zoo’s primate population, the last of her kind in North America, has died. The zoo humanely euthanized Toi on Wednesday after a recent serious health decline, ...

PHILADELPHIA (AP) - The Philadelphia Zoo says a 21-year-old red-shanked douc langur monkey has been euthanized due to a serious decline in health. The zoo says the female primate named Toi had a ...

Holly has a degree in Medical Biochemistry from the University of Leicester. Her scientific interests include genomics, personalized medicine, and bioethics.View full profile Holly has a degree in ...

PHILADELPHIA — The Philadelphia Zoo says a 21-year-old red-shanked douc langur monkey has been euthanized due to a serious decline in health. The zoo says the female primate named Toi had a variety of ...

With a recorded total population speeding towards fewer than 2,000, the critically endangered gray-shanked douc langur (Pygathrix cinerea) is one of Vietnam’s rarest primates – but the discovery of a ...