Rare twin male giraffe calves were born at the San Francisco Zoo Tuesday morning, but only one survived, zoo officials said Friday.
The stronger calf weighed 100 pounds and is 5'6" tall and was "immediately healthy, alert and nursing," zoo spokesperson Abbie Tuller said. The second giraffe was described as "much smaller and weak at birth and was not able to nurse or function independently on his own," Tuller said.
Despite efforts by the zoo's medical staff, he passed away due to post-birth complications.
Twin reticulated giraffe births are an extremely rare occurrance -- the birth at San Francisco Zoo is only the tenth recorded live birth of both twins in zoos worldwide.
“This is a bitter-sweet announcement to make, but this very unique twin birth is something for all of the Bay Area to take pride in,” SF Zoo president Tanya Peterson said.
The surviving calf is yet to be named, Tuller said.
His mother is 11-year-old Bititi, who was born at the Oakland Zoo and went across the bay to call San Francisco Zoo her home in 2005. His father is 12-year-old Floyd, who was born in Albuquerque at the Rio Grande Zoo.