Coat of arms of the Dutch – Indonesian tree
Only knights who had participated in the Crusades were allowed to add ducks at their family coat of arms. The Coert Family in Germany participated in the Crusades. https://nl.wikipedia.org/wiki/Merlet_(heraldiek)
Herbert Floris Coert [1917 – 2015] didn’t like the ducks. He prefered lions.
Coat of arms of the German – Dutch tree