Anna's Hummingbird (image) Harvard Medical School Share Print E-Mail Caption Evolution at a molecular level and Research explains what anyone with a backyard birdfeeder knows: Hummingbirds have a taste for sweet nectar. Understanding taste is a way to understand pleasure and aversion, reward and punishment, sweet and bitter -- and how the neural circuits in our brain work in perception. Credit Maude Baldwin Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.