Flying with excess baggage is a drag, but hummingbirds have mastered efficient packing. The tiny hoverers have less DNA in their cells than any other previously studied birds, reptiles or mammals, researchers report online August 5 in Proceedings of the Royal Society B. Among hummingbird species, however, genome size doesn’t vary along with body size, suggesting that birds’ DNA was pared down before the diversification of today’s hummers.
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