One person was arrested on Monday after reportedly taking a woman hostage at a German train station.
After building a nest together from ice pebbles, male penguins Magic and Sphen were given a real egg to foster by the staff at Sydney's Sea Life Aquarium.
"She didn't have any enemies ... It's just a mystery for all of us," Kelsey Quayle's sister Kayleigh Martin said.
"Their Royal Highnesses have appreciated all of the support they have received from people around the world since their wedding," the palace said.
Merkel's allies slumped to their worst election results in decades. Big winners were the environmentalist Greens and far-right Alternative for Germany.