The Queen was introduced to her young namesake - an eight-month-old elephant called Elizabeth - as she became zookeeper for a day in Bedfordshire.
Staff at Whisnade Zoo told the royal visitors the calf was "doing wonderfully in the herd" and was quickly learning how to work with the keepers - including having her teeth checked.
After getting a tour of the new care centre, which she officially opened, the Queen and the Duke of Edinburgh headed outside to feed one of Elizabeth's companions, Donna.
The seven-year-old cow seemed very keen to get her trunk of the bananas - quickly grabbing one from the Queen's hands.
She twice had to be pointed in the direction of the Duke after trying to seek out more treats.
Baby elephants at a Bedfordshire Zoo - including one named in honour of the Queen - are ready to receive their royal visitor.
The Queen and the Duke of Edinburgh will officially open an elephant centre at the Bedfordshire zoo.