Parents worry about protecting their children from online predators. But some just aren't worried enough, it seems.

That's one conclusion online safety experts say can be drawn from a recent survey of parents by Panda Security, a security software maker. While more than half the parents polled rank online predators, pornography and violence as the biggest online threats to children, a quarter of those surveyed still never monitor their children's online activities.

"You could interpret these numbers to indicate that while generally parents are concerned about online threats to their children, they're not yet doing enough about it," says Sean-Paul Correll, a threat analyst with Panda.

Several highly publicized surveys have made online risks to children appear significant, while other studies seem to downplay the threats. Panda's survey found that just 7 percent of respondents reported they or their children have been a victim of an online attack. "But if it's your child viewing the inappropriate material or being approached by an online predator, all the statistics in the world are meaningless," Correll points out. "If your child is the one at risk, that's one too many."