As announced on July 10, 2025, Toto, Western Lowland Gorilla at Ueno Ueno Zoo, had been experiencing abnormal genital bleeding for some time.

After receiving examinations from obstetricians and gynecologists and conducting thorough reviews, it has been decided that treatment to stop the bleeding will be performed under anesthesia on Wednesday, September 17, 2025.

On the day of treatment, it will be difficult to isolate just one gorilla, so the exhibition of all gorillas will be suspended. Depending on Toto's condition, the exhibition of Western Lowland Gorilla from Thursday, September 18th onwards may also be suspended.

We apologize for any inconvenience this may cause, and we appreciate your understanding.


Western Lowland Gorilla "Toto"

Added on September 18, 2025

The animal underwent treatment under anesthesia on Wednesday, September 17th. We will resume normal operations on Thursday, September 18th, while carefully monitoring its condition.

(September 8, 2025)
(September 18, 2025: Added information regarding the reopening of the exhibition)