The male Great Horned Owl in his daytime perch in a live oak tree in the backyard.  You can see him get sleepy and yawn, and he almost falls off the branch as he dozes off.  He then works up a good “yack” to cough up a pellet of bones and hair – probably the indigestible bits of a rat he had for dinner. As the day wears on and the temperature rises, he begins panting to cool off.  And then he goes back to sleep.