A bald eagle arrives to steal a perch on a tree log that offers a strategic view of the shoreline at the Chilkat Bald Eagle Preserve in Alaska. When other eagles drag freshly caught salmon in from the water, these bystanders swoop in to take a share. Photo by Karthik Subramaniam

After several years off, National Geographic magazine has brought back a public photo contest and invited hobbyist photographers to send in their best images of the natural world.
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