Penguins didn't always boast tuxedo-like black-and-white markings, according to a new study. The discovery of the first ancient penguin fossil with evidence of feathers reveals the aquatic birds ...

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"To tell the sex of a Galápagos penguin, measure its beak, researchers say." ScienceDaily. ScienceDaily, 28 June 2018. <www.sciencedaily.com / releases / 2018 / 06 / 180628105059.htm>.