Dozens of brown bears in Russia have developed a nose for aviation fuel.
The bears have been photographed sniffing kerosene and gasoline from containers used to power generators and helicopters by Kronotsky Nature Reserve workers in the far east of Russia.
Photographer Igor Shpilenok, 52, said some bears even stalked helicopters and waited for drops of fuel to leak during take-off, the Daily Mail reported.
The bear would then spend some time at the site sniffing the ground, taking deep breaths and rolling around, before digging a hole in the place with the strongest odour and lying there in a 'nirvana' position.
He said there were a few barrels of gasoline which workers of the nature reserve didn't take in time, "and a female bear named Suzemka - who is apparently fascinated by the smell of fuel - used the opportunity".
"She seems to be one of the addicts," he said.
The reserve is home to more than 700 brown bears.