Scientists have been puzzled by the fact that hummingbirds maintain such a sugary diet without a sweet-taste receptor.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/IMoLiMQ8o7k" height="1" width="1"/>
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Scientists have been puzzled by the fact that hummingbirds maintain such a sugary diet without a sweet-taste receptor.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/IMoLiMQ8o7k" height="1" width="1"/>