Medical residents, who removed their clothes to protest against working conditions, take part on a protest during a strike in Barcelona, Spain, Tuesday, October 20, 2020. Regional authorities across Spain continue to tighten restrictions against a sharp resurgence of coronavirus infections that is bringing the country’s cumulative caseload close to one million infections, the highest tally in western Europe. (Photo by Emilio Morenatti/AP Photo)

The National Geographic Photo Ark is a travelling exhibition of photographer Joel Sartore’s quest to create a photo archive of biodiversity around the world. So far, Sartore has captured studio portraits of more than 6,000 species – a number that he hopes to double. On 1 July, the ark will open at Melbourne zoo – the first time it has been exhibited in the southern hemisphere. More than 50 portraits will be on display, including many of Australian endangered animals being protected by programs at the zoo itself. These captions have been edited from text supplied by Melbourne zoo. Here: Barking owl. (Photo by Joel Sartore/National Geographic Photo Ark/The Guardian)

A small section of the expanding remains of the Veil Nebula, a massive star that exploded about 8,000 years ago. The entire nebula is 110 light-years across, covering six full moons on the sky as seen from Earth, and resides about 2,100 light-years away in the constellation Cygnus, the Swan. (Photo by Reuters/NASA/ESA/Hubble)

An animal rights activist washes herself with red dye to mimic blood during a protest against the testing of shampoo on animals in Barcelona. April 24, 2012. (Photo by Raul Albaledo/AFP Photo)

A protestor is detained following the grand jury verdict on September 23, 2020 in Louisville, Kentucky. Protesters marched in the streets after a Kentucky grand jury indicts one of the three officers involved in the killing of Breonna Taylor, who was fatally shot by Louisville Metro Police officers during a no-knock warrant at her apartment on March 13, 2020 in Louisville, Kentucky. (Photo by Brandon Bell/Getty Images)

A family poses for photos near a dinosaur exhibits along the Changi Jurassic Mile as it is light up for Christmas near Changi airport in Singapore on December 8, 2020. (Photo by Tim Chong/Reuters)

A GDR Trabant car drives through the city during the local coronavirus disease (COVID-19) lockdown in Dresden, Germany, December 14, 2020. (Photo by Matthias Rietschel/Reuters)

A medical worker in protective gear sprays mist on her colleague during a hot day at an outdoor clinic for coronavirus tests at a public health facility in the southwestern city of Gwangju, South Korea, 05 June 2020. (Photo by Yonhap/EPA/EFE)