Invader

This is also an invariant of history. Gallic disappeared because Gallic elites were quick to send their children to the Roman school. In the same way, provincial elites later taught their offspring French at the expense of the regional languages. The ruling classes are often the first to adopt the language of the invader. They do the same today with English.

Food allergy sufferers can experience fatigue and brain fog as the immune system attacks a nonexistent invader.

But the invasive European green crab pushes native crabs out of their burrows. Under pressure from the invader, native crabs are eating less marsh grass. Marshes are recovering, and their carbon storage capacity is growing with them.

Phragmites grows much taller, denser and with deeper roots than the native marsh grass it overruns. But those same traits that make it a powerful invader also mean it stores more carbon than native species.

Death to the invader!

U.S. Department of Agriculture researchers have released tiny parasitic wasps in forests in Maryland to attack the emerald ash borer, an invader from China that is devastating forests across the northern United States.

One of the most destructive invasive species in North America's Great Lakes was also the first one to arrive. The sea lamprey invaded the Lakes more than a hundred years ago, and in all that time, no one's been able to get rid of it. It's the only invader in the Lakes that managers have been able to control, but it takes millions of taxpayers' dollars every year to keep the blood-sucking parasite in check.

A strange looking motorized raft, loaded with all kinds of cameras, sensors and high-tech widgets, looks like an invader from outer space. But it serves the down-to-earth purpose of making extraordinary maps of waterways of the Chesapeake Bay watershed in the Eastern United States.

The invader keeps blaming the victim for the invasion.

Well, Josh may be a home wrecker, but he's not a home invader.