Tongue
Can you peek into the mouth and see the eaglet's tongue? Eagles use their tongues to help them swallow, just as we do. But their tongues are not as long, so they can't stick them out. An eagle usually keeps it mouth shut. When hot or nervous, eagles open their mouths to pant. This picture was taken on a sunny day, so the eagle may be warm. Or it might be nervous having a photographer stare at it.