National Zoo will celebrate World Cassowary Day on Saturday by putting on show brothers Irwin and Dundee. Cassowaries are ...

The mystery of the cassowary's casque has been solved, but scientists have more questions that have yet to be answered.

Ostriches, emus, rheas, and other giant flightless birds now inhabit six continents separated by oceans. Their global distribution has puzzled scientists for decades, as these massive ...