They travel in large groups, commonly known as the "fish of the sea."

They urged students to travel in groups and to go home immediately after school.

While most Japanese continue to travel in groups, many are now striking out on their own.

I saw people sometimes, travelling alone like me, or in groups.

They usually traveled in groups of two or three men.

It is best to travel in large groups and to stay together.

It is always wise to travel in groups of two or more people.

Always be aware of your surroundings, and try to travel in groups.

I always thought they only traveled in groups of two or three.

The visitors must travel in groups of at least 10.