“New research suggests that wild hummingbirds can keep count as they forage and use their counts to keep track of the sweetest flowers.
The new paper, published on July 8 in the Proceedings of the Royal Society B, found that male rufous hummingbirds can learn which fake flower in a sequence holds a nectar-like syrup. Only one flower in ten held syrup. But even when the researchers moved the location of the artificial flowers and the distances between them, scientists observed the birds returning to the syrup-filled flower.”
View the whole story here: https://www.smithsonianmag.com/smart-news/hummingbirds-learn-count-find-their-favorite-flowers-180975285/