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Some individuals spent more than a year in isolation — a situation which the report said presents heightened risk to those with underlying mental health conditions.

The report said poor air quality, access to healthcare, extended periods locked in cells and increased isolation could "lead to a loss of hope."

Zoo as No. 1 on its “10 Worst Zoos for Elephants” list for the second year in a row this year, citing Billy’s and Tina’s poor health and social isolation.

He wants to maximize every deal in isolation whether that is with China, Vietnam, or Lesotho.

"If I lived by myself, maybe even a bit in isolation, it would be of no use to me," he said back then.