Colchester Zoo has announced the loss of its last two sea lions, Sydney and Milan, who were put to sleep on 6 March 2026, marking a significant change for the Colchester, Essex attraction as the pair were the final remaining animals in the marine exhibit.
The Colchester Zoological Society confirmed the decision was made by the veterinary team because of the animals’ advanced age. Staff stated that the move was made compassionately to ensure the sea lions did not suffer and to preserve their quality of life.
Sydney and Milan had been under close supervision before they passed away peacefully. Their deaths follow the loss of another sea lion named Winnipeg, who passed away at the zoo earlier in February 2026.
The loss of the animals represents the end of the current sea lion group at the facility. Staff at the zoo shared the news with sadness, noting that the geriatric sea lions had been a part of the community for many years.
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