Visitors watch an orca performance at SeaWorld in San Diego this year. The company has seen attendance slip in the year since the release of a documentary film critical of the company's captive whale program.
"The State of the Birds" 2014 report found that red knots (above) and other shorebirds are among the most threatened groups in the U.S. More than half of U.S. shorebird species are on the report's Watch List — species that are currently endangered or at risk.
Gerrit Vyn/The Smithsonian Institution
A box of chicken eggs painted to look like marbled murrelet eggs. The eggs contain a chemical that induces vomiting. Scientists are trying to teach the endangered bird's predator, a type of jay, to avoid murrelet eggs.