Oregon Zoo's Elephant Tose-Tu Gives Birth To Beautiful Calf. After more than 20 months of pregnancy, Rose-Tu, a 30-year-old Asian elephant at the Oregon Zoo, gave birth to a beautiful calf on 1 February.

It isn’t just locals who are admiring the adorableness of the newly born elephant calf at the Oregon Zoo in Portland. On Saturday, after 20 months of pregnancy, Rose-Tu gave birth to a calf, the first live elephant calf born at the zoo in more than a decade,