Fire investigators say the fire at Chester Zoo at the weekend was caused by an electrical fault.
It took 80 firefighters to tackle the blaze at Monsoon Forest, at Chester Zoo, on Saturday 15 December.
Area manager at Cheshire Fire and Rescue Service Lee Shears said:
“This was a large and complex operation involving more than 80 firefighters from Cheshire, Merseyside and North Wales Fire and Rescue Services.
Jamie Christon, Chester Zoo’s Chief Operating Officer, said:
“We’re grateful that the Fire and Rescue Service has been able to conclude its investigation into the cause of the fire so swiftly and would again like to thank them for their valiant efforts on the day, which helped us to rescue so many animals and minimise the extent of the damage.