Revealed: Nasa killed all 27 monkeys held at research center on single day in 2019

• 27 primates euthanized at California facility
• Outcry over revelation that animals were not sent to sanctuary

Every monkey held by Nasa was put to death on a single day last year, documents obtained by the Guardian show, in a move that has enraged animal welfare campaigners.

Related: ‘Barbaric’ tests on monkeys lead to calls for closure of German lab

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