The eagle has been part of the coats of arms of the rulers and governments of Germany since the days of the Holy Roman Empire.
Many of the eagles - some double headed, other single headed - are similar, but none resemble the eagles adopted by the Nazi Party and the Third Reich in the years preceding World War II.
A controversy has erupted in Philadelphia over a tattoo worn by a police officer that resembles the eagle used in the Nazi emblem, known as the parteiadler.
The parteiadler and the national emblem, or reichsadler, adopted by the Nazis in 1935, two years after they took power, are different in that they are looking in different directions.
Photos of the police officer's tattoo, which has its head facing the same way as the parteiadler, do not show whether the eagle is perched on a swastika. It is on his left arm, under the word "Fatherland" in gothic text.
Here are eagles from German coats of arms from before the Nazis and after.
1928-1935 and 1949-Present (It is now called the bundesadler.)
This is a photograph of the eagle in the officer's tattoo:
— mindy isser (@mindyisser) September 1, 2016