In this image released by the San Diego Zoo, a zoo worker cares for two of the worlds most critically endangered great apes, called bonobos on Friday, November 9, at the San Diego Zoos Children Zoo nursery in San Diego. With wild populations being decimated at alarming rates in Democratic Republic of Congo, the recent birth of a male infant named Tutapenda (L), on Oct. 29 is a significant milestone for conservation efforts. He joins his two-month-old half-sister Mali who is also being hand-raised due to medical complications at birth.