Science How did the hummingbird get its sweet tooth? Scientists unravel mystery.

Like all other birds, hummingbirds lack sweet-taste receptors. Now, science can explain how this tiny bird got its taste for nectar.

By , LiveScience News Editor

Maude Baldwin

Nectar-slurping hummingbirds clearly ­have a taste for sweets — but they shouldn't. Like all other birds, they lack sweet-taste receptors on their palates and long tongues, so in theory, they should be immune to the temptations of sugary foods.