From what little we know about their behavior and capabilities, it's impossible to say how great a threat the aliens actually present.

Most species are very rarely observed, and little is known about their behavior.

No other information is known about its behavior.

In the tape, Laurie said she knew about her husband's behavior, but felt powerless to stop it.

Little is known about their behavior, but they are believed to feed on leaves, grasses and other plant material.

As the bird became extinct before significant field observations could be made, not much is known about its behavior.

Little is known about its behavior due to the paucity of sightings.

Yet the public also seems increasingly insistent on its need to know about public figures' private behavior.

Although little is known about his behavior during this period, he did not settle down.

Little is known about the great white shark's behavior in the way of mating habits.