Duck Penises Grow Bigger Among Rivals loading...
Duck Penises Grow Bigger Among Rivals
Size matters when it comes to the social setting for some ducks, a new study finds.
Penguins Caught Feasting on an Unexpected Prey loading...
Penguins Caught Feasting on an Unexpected Prey
Researchers mounted cameras on the backs of four species and were surprised by what they found on penguins' menu.
13 Photos Capture the Beauty and Ferocity of Birds loading...
13 Photos Capture the Beauty and Ferocity of Birds
See winning images from this year's Bird Photographer of the Year contest.
New Feathered Dinosaur Had Four Wings but Couldn't Fly loading...
New Feathered Dinosaur Had Four Wings but Couldn't Fly
In a surprise for paleontologists, the well-preserved fossil suggests that the animal spent its life scampering around on the forest floor.

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