Asian elephant Rose-Tu gives birth to 200lb calf at Oregon zoo

After 20-month pregnancy, Rose-Tu gives smoothest birth' with baby standing up on her own within 15 minutes'

The Oregon zoo in Portland has welcomed its newest addition, a baby elephant.

Thirty-year-old Asian elephant Rose-Tu gave birth on Saturday after 20 months of pregnancy, the zoo said in a news release. The calf appeared to be a 200lb (90kg) female, but zoo staff are giving the pair time to bond before conducting a first checkup to confirm weight and sex.