“In zoos in Wales:
• Only 9% of species are endangered
• Only 17% of species are threatened
• 84% of mammals; 95% of birds; 93% of reptiles; 79% of amphibians are not endangered
The most common species held in Welsh zoos are the house mouse and guinea pig.” https://www.captiveanimals.org/con-in-conservation
The zoos stressed that they were clearly interested in conserving their business model, and claimed the house mice were living within buildings of their own free will.