Scientists also believe that birds have some very different traits from their relatives, such as feathers instead of scales (though most birds have reptile-like scales on their legs and feet), pointed beaks, and wings. People who study birds are called ornithologists.cientists also believe that birds have some very different traits from their relatives, such as feathers instead of scales (though most birds have reptile-like scales on their legs and feet), pointed beaks, and wings. People who study birds are called ornithologists.
4 / 6 Show Caption + Hide Caption â Under Secretary of the Army Joseph W. Westphal talks with senior leaders at the Joint Readiness Training Center, or JRTC, about how to most effectively train Soldiers for the future, Oct. 18, 2012, at Fort Polk, La.
Juvenile rheumatoid arthritis (JRA), often referred to by doctors today as juvenile idiopathic arthritis (JIA), is a type of arthritis that causes joint inflammation and stiffness for more than six weeks in a child aged 16 or younger. It affects approximately 50,000 children in the United States.