Prior to migration, a hummingbird consumes large amounts of nectar and insects, nearly doubling its weight.The added weight is stored primarily as

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The added weight is stored primarily as fat because it is the most compact fuel. This allows the hummingbird to carry a high energy density, which is essential for long-distance migration. Glucose and glycogen are not as efficient at storing energy as fat, while protein is not a preferred energy source due to the need for it in muscle repair. Water, while important, is not a fuel and is unlikely to be stored in large amounts.

Prior to Migration, a Hummingbird Consumes Large Amounts of Nectar