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Sizi was discovered wandering alone while severely hydrated and it is thought that she became orphaned because of poaching.
Both babies were rescued by the Zimbabwe Elephant Nursery (ZEN) - which is well-known for the work it does rescuing elephants who are in danger and then nursing them back to health through a rehabilitation process.
Moyo now weighs 300kg and is growing up very well, while Sizi recovered from her heart-breaking state - thanks to Zen's efforts.
And part of their work involves feeding the younger calves with specially-formulated milk. It seems the Moyo and Sizi have no complaints about this at all - judging by their reactions to being given milk in a recently-posted video.