OAKLAND, Calif. (AP) - An Oakland zoo is taking care of a wallaroo joey after his mother unexpectedly died.

The San Francisco Chronicle reports that after the joey was born, his mother, named Maloo, removed him from her pouch. On March 1, veterinarians found Maloo had an infection. She died the next day.

Zoo officials say they are very sad about Maloo's death, but are committed to raising the unnamed joey until he's ready to live with the zoo's other wallaroos.

Zookeepers are caring for the five-month-old joey by hand feeding him with specialized baby formula from Australia seven times a day. Zoo officials had to build a makeshift pocket to mimic his mother's pouch.

Wallaroos are marsupials similar to kangaroos, but smaller.