Precious was a whale that a ground sloth named Granny had kept as a pet.
A massive whale, Precious was the pet of a ground sloth dubbed Granny, though Granny's family thought her senile for mentioning Precious: indeed, Granny's grandson named Marshall, expressed that she was crazy for talking about her "dead pet". Precious was alive and in the oceans, where the whale grew to an enormous size.
Large, even for a whale, Precious was immense and the beloved pet of Granny, who was always seen throwing food into the ocean when she was near it, so that Precious might eat. Precious was loyal to Granny, so much that Granny could step inside the whale's mouth and commandeer it like a ship.
Precious' huge size was perhaps it more distinguishable trait. It's mouth, which was lined with rows of giant teeth, was large enough to accommodate an animal the size of a mammoth. Precious could also use it's blowhole to blast jets of water to knock away any threats.
- Precious' gender is unknown. Flynn calls Precious "Mr. Whale", that means Precious is male character. Granny is always calling Precious a girl, which means Precious is female character. However, Granny is calling Diego a lady, even through Diego is male. So, it might be Precious is male, too.