Los Angeles Zoo sees first hippo birth in 26 years

LOS ANGELES -- The Los Angeles Zoo had a surprise on Halloween -- the trick-or-treat birth of a baby hippopotamus.

The hippo was born last Friday. That's the treat. And the trick -- the mother was supposed to be on birth control!

Staffers say they noticed the mother hippo gained weight, which made them suspect she was pregnant.

The baby's gender hasn't been determined yet. But vets say the baby appears to be doing well and is bonding with mom. The zoo posted video of the two on YouTube.

Media will get to see the newborn Tuesday in its public debut.

The mother, 10-year-old Mara, came to the zoo in December from Topeka, Kansas. The father is a 3-year-old named Adhama, who arrived from the San Diego Zoo last year.

It's the first baby hippo at the Los Angeles Zoo in 26 years.

The Associated Press contributed to this report.