This bird has a call that sounds like crazy laughter. Hence the phrase 'crazy as a loon' . The phrase means that you should not give up something that you have already gained in hopes of finding something better. 620 - 564 B.C. It first appeared in print in England in a book called Latin Medieval Proverbs in the 1400s. This means the highest point possible.
Crows have the habit of nesting on top of a platform of sticks.
The nest is always at the very top of a tree. By the 1600s, sailors had started calling the highest point on the mast, used for a lookout, the crow's nest. This phrase, which means stop, first was used during the 1950s on the Roy Rogers and Dale Evans Show. Pat Brady played the sidekick of Roy and Dale. His character was a cowboy who was afraid of horses.