After examining bird no. 1, the doctor said, "You are in fine shape, just need a little rest. By evening, you'll be flyin' off into the sunset". And early in the evening, the great eagle was seen flying westerly among the trees.

When bird no. 2's medical was completed, the doctor advised, "You're a bit run down. Rest for a day and a half' then you'll fine and ready to fly again soon". Two days later, someone spotted the owl on a midnight flight among the trees.

After finishing the physical exam of bird no. 3, the good old doc said, "You need lots of rest, you're pretty much exhausted. Better rest up at least a week and then you'll be ready to fly among others of your kind".

The 3rd bird replied' "Doubt that !!"

The Doc asked, "Why not ?"

The 3rd bird, "Cause I'm an ostrich".