Hummingbirds weigh less than a penny! a penny weighs approximately 3-4 grams, depends on what year they where coined, and Hummingbirds (not all of them, a hummingbird can weigh between 2-20 grams, but a specific kind of hummingbird, the Bee Hummingbird).
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Source: Wikipedia – Hummingbird
Photo by Marcial4