“This decision was made with deep care and compassion, with their wellbeing at the heart of every process.”
Capybaras are native to South America and are the largest living rodents in the world.
In the wild, their life expectancy is around seven to 10 years.
Birmingham Wildlife Conservation Park said: “Katherine, Gertrude, and Esmeralda were truly special members of our community.
“Gentle, curious, and full of character, they were adored by visitors and held a very special place in the hearts of our staff and volunteers.
“Whether you were lucky enough to see them lounging by the water or sharing quiet moments with each other, it was clear how much joy they brought to so many.”
They added: “We’ll miss them greatly — as individuals and as a trio — and we know many of you will too.”