Japanese history had a feudal social structure for a long time.

This country has a gerontocracy political system.

He is the true ruler of this country.

He is a ruling presence in the class.

Feudalism was one of the social systems in medieval Europe.

The Eurasian lynx is often hunted for its beautiful fur.

The blue mussel is a part of delicious seafood dishes.

The European bitterling is known for its beautiful colors.

Heads of state from each country participate in the European Union conference.

European eels can live in both fresh and salt water.