This behavior is known to occur in several other species of shark as well.

This is known to occur at least three times per reproductive event.

It is known to occur almost always under natural conditions in wetlands.

But symptoms have been known to occur from 3 weeks to many years after infection.

Sudden weather changes have been known to occur in the area.

More than 60 species of trees are known to occur on the Complex.

This plant is known to occur at only about eight locations.

The explorers passed through an area where the disease is known to occur.

Such acts of violence are known to occur throughout the world.