WTF Fun Fact – Hummingbirds That Double Their Size

Ruby-throated Hummingbirds are able to fly across the Gulf of Mexico, ~500 miles, in one 20-hour non-stop flight. This flight requires more calories than the bird’s weight of ~3g, so they prepare by doubling their fat mass. They then expend their entire caloric reserve during the migration. – WTF Fun Facts

Source: Ruby-throated hummingbird – Wikipedia

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