Roosters in Western paintings

The Cock of Liberation, by Pablo Picasso, 1944 [Photo/Artron.net]

This brightly colored painting expresses France's joy of regaining its freedom after Nazi occupation. France was once called "Gallia", which means "rooster" in Latin, so the rooster became a symbol of France. This might be the reason Picasso chose the rooster as a major symbol in this painting.