Hummingbirds are very small birds with a high metabolism. A great deal of energy is spent flying, so they must feed almost constantly. Hummingbirds can consume up to twice their body weight in nectar every day. They usually feed on nectar and insects. Hummingbirds actually lap up the nectar with their tongues. A lot of people think that hummingbirds have a hollow tongue like a straw. Their tongues do have grooves on the sides that collect nectar. When the bill constricts, the hummingbird can swallow the nectar from flowers and feeders.
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