Observatory: For Hummingbirds, It?s Easy to Shift Into Reverse

[unable to retrieve full-text content]A new study has reported that backward flight is almost as efficient as forward flight.

Source: http://www.nytimes.com/2012/10/02/science/for-hummingbirds-its-easy-to-shift-into-reverse.html?partner=rss&emc=rss

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