Hitler probably got the idea for the Nazi eagle flag from the Falangists (flan?) flag. After all they share the same philosophy.
Don't think so. The eagle is used by many nations as a national symbol.
HEre is a list.
Eagles as national symbols
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Double-headed eagle emblem of the Byzantine Empire. Relief from the Ecumenical Patriarchate of Constantinople (Istanbul)
Coat of arms of the town of Berg en Terblijt in the Netherlands, an example of the prolific use of the eagle in European heraldry.
Napoleonic eagle
The Great Seal of the United States
Eagles have been used by many nations as a national symbol.
The coat of arms of Navarre/Basque Country Kingdom has a black eagle.
The coat of arms of Albania has a black double-headed eagle.
The coat of arms of Armenia has a gold eagle and lion.
The coat of arms of Austria has a black eagle.
The coat of arms of the Czech Republic integrates the symbols of Moravia and Silesia (both with female eagles in their emblems - red-and-white chequered and black respectively) on the coat of arms of the Czech Republic with Bohemia's lion.
The coat of arms of Egypt is a golden eagle looking towards the viewer's left.
The coat of arms of Germany has a black eagle.
The coat of arms of Ghana has two golden eagles holding it.
The coat of arms of Indonesia has an eagle-like garuda carrying a shield on its neck and a banner on its feet.
The coat of arms of Iraq has the golden Eagle of Saladin
The coat of arms of Jordan has a black eagle.
The coat of arms of Mexico golden eagle perched upon a cactus devouring a snake.
The coat of arms of Moldova consists of a stylized eagle holding a cross in its beak and a sceptre and a branch in its claws.
The coat of arms of Montenegro represents the two-headed eagle in flight.
The coat of arms of Nigeria has a red eagle on top.
The Insignia of the Pakistan Air Force includes the Peregrine Falcon State Military national bird.
The coat of arms of Panama has a harpy eagle
The coat of arms of the Philippines has the bald eagle of the United States.
The coat of arms of Poland has a white eagle with a golden beak and talons wearing a golden crown.
The coat of arms of Romania has a golden aquila holding a cross in its beak and a mace and a sword in its claws.
The coat of arms of Russia has a double-headed eagle.
The coat of arms of Serbia has a white bicephalic eagle of the House of Nemanjić.
The coat of arms of Syria formerly had the eagle of Saladin.
The Great Seal of the United States has a bald eagle.
The coat of arms of Yemen depicts a golden eagle with a scroll between its claws.
The coat of arms of Nigeria has a red eagle on top.
Hellenistic Egypt. The Ptolemaic rulers of Egypt used it as their seal.
First French Empire. Napoleon Bonaparte used the Roman Golden Eagle as the symbol of his new French empire.
Persian Empire. The symbol of Persian Army was an Eagle
Rome. The Romans used it on the standards of their armies. From this derives:
The late Byzantine Empire chose a two-headed golden eagle as its symbol. It is popularly that one head symbolised ancient Rome, and the other head symbolised "new Rome" at Constantinople. From this derives:
Albania. The two-headed eagle is the emblem of "Shqipëria" or Land of the Eagles, which is known in English as Albania (see The Tale of the Eagle for the legendary origin of the name)
Russian Empire. After the fall of Constantinople, the Russian Empire took the two-headed eagle as its own symbol.
Charlemagne and Holy Roman Empire. After his crowning as the new Roman Emperor, Charlemagne adopted the ancient Roman eagle as his own symbol. The Holy Roman Empire born of his kingdom took the eagle, but the Habsburgs replaced the golden eagle by an imperial eagle. From this derives:
Austria. The Austrian Empire had a two-headed eagle as its symbol. After the abolition of Austria-Hungary, Austria took as its symbol a one-headed eagle in the modern coat of arms of Austria.
Germany and Prussia. Prussia, and later Germany have used a black eagle as their national symbol.
Spain. The Catholic monarchs, Isabella and Ferdinand, used the eagle as a part of the royal shield representing Saint John the Evangelist. The eagle was again on the Spanish shield under the Francoist regime and the transition to Democracy (1939-1981).
The Seljuk Turks and Ottoman Turks used a double-headed eagle as coats-of-arms.>>