Newborn orangutan Rieke is presented during a press conference at Berlin Zoo, in Berlin, Germany, February 6, 2015. The baby was born on January 12, 2015 weighing 2,290 grams and is bottle-fed by keepers. (Photo by Ralf Hirschberger/EPA)

Female orangutan baby Rieke is shown during a news conference at the Berlin Zoo Friday February 6, 2015. Rieke was born on January 12, 2015. (Photo by Ralf Hirschberger/AP Photo/DPA)

Three week old female orangutan baby Rieke is pictured during a presentation to the media at the Zoo in Berlin February 6, 2015. (Photo by Fabrizio Bensch/Reuters)

Newborn orang-utan Rieke at a press conference at Berlin Zoo, 6 February 2015. (Photo by Ralf Hirschberger/AP Photo/DPA)

Three week old female orangutan baby Rieke looks to a photograph during a presentation to the media at the Zoo in Berlin February 6, 2015. (Photo by Fabrizio Bensch/Reuters)

Three week old female orangutan baby Rieke is pictured during a presentation to the media at the Zoo in Berlin February 6, 2015. (Photo by Fabrizio Bensch/Reuters)

Three week old female orangutan baby Rieke is fed by a zookeeper during a presentation to the media at the Zoo in Berlin February 6, 2015. (Photo by Fabrizio Bensch/Reuters)

Three week old female orangutan baby Rieke is pictured during a presentation to the media at the Zoo in Berlin February 6, 2015. (Photo by Fabrizio Bensch/Reuters)

Three week old female orangutan baby Rieke is pictured during a presentation to the media at the Zoo in Berlin February 6, 2015. (Photo by Fabrizio Bensch/Reuters)

Three week old female orangutan baby Rieke is weighed by a zookeeper during a presentation to the media at the Zoo in Berlin February 6, 2015. (Photo by Fabrizio Bensch/Reuters)

Female orangutan baby Rieke is shown during a news conference at the Berlin Zoo Friday February 6, 2015. (Photo by Ralf Hirschberger/AP Photo/DPA)