Volunteers wearing face masks, gloves and protective gear to protect against coronavirus, gather to clean an area of an outdoor book market set up at Red Square with GUM, State Department store, left, St. Basil's Cathedral, center, Spasskaya Tower, second with, and the Kremlin Wall, right, in Moscow, Russia, Saturday, June 6, 2020. Muscovites clad in face masks and gloves ventured into Red Square for an outdoor book market, a small sign of the Russian capital's gradual efforts to open up amid coronavirus concerns. (Photo by Alexander Zemlianichenko/AP Photo)

A demonstrator holds up her fist, in front of police officers during a protest, organised by Black Lives Matter Belgium, against racial inequality in the aftermath of the death in Minneapolis police custody of George Floyd, in central Brussels, Belgium on June 7, 2020. (Photo by Yves Herman/Reuters)

People enjoy the color run in Guangzhou, Guangdong province of China on May 29, 2022. (Photo by Stringer/Anadolu Agency via Getty Images)

Two men cross the street in front of a burned-out bus standing beneath a residential building, in the district Neukoelln in Berlin, Germany, Tuesday, January 3, 2023. People across Germany on Saturday resumed their tradition of setting off large numbers of fireworks in public places to see in the new year. The bus was set on fire during the New Year's celebrations. (Photo by Markus Schreiber/AP Photo)

A man walks past a mural along a street in New Delhi on June 30, 2023. (Photo by Arun Sankar/AFP Photo)

A boy evacuates to safer grounds at the onslaught of Typhoon Rammasun (locally known as Glenda) which battered the city Wednesday, July 16, 2014, in Manila, Philippines. (Photo by Bullit Marquez/AP Photo)

Dan McManus and his service dog Shadow hang glide together outside Salt Lake City, Utah, July 22, 2013. McManus suffers from anxiety and Shadow's presence and companionship help him to manage the symptoms. The two have been flying together for about nine years with a specially made harness for Shadow. (Photo by Jim Urquhart/Reuters)

“Cassowaries are large, flightless birds related to emus and (more distantly) to ostriches, rheas, and kiwis”, writes Olivia Judson in the September issue of National Geographic magazine. How large? People-size: Adult males stand well over five foot five and top 110 pounds. Females are even taller, and can weigh more than 160 pounds. Dangerous when roused, they’re shy and peaceable when left alone. But even birds this big and tough are prey to habitat loss. The dense New Guinea and Australia rain forests where they live have dwindled. Today cassowaries might number 1,500 to 2,000. And because they help shape those same forests – by moving seeds from one place to another – “if they vanish”, Judson writes, “the structure of the forest would gradually change” too. (Photo by Christian Ziegler/National Geographic)