The latest photo challenge calls for you to take and send in your best pictures of trees. Here's how to enter.

It gave early risers or those who prefer to take pictures later in the day each ... Hawaiian Green sea turtle come ashore to sleep at about sunset. After resting they head back out to sea at ...

Readers’ photos celebrate sunrises and sunsets, when the light is the most pleasing. Fifty-one photos were sent in; here are the top picks.