00:35 Swarm of Grasshoppers Has Left Nevada But Could Return The swarm of grasshoppers that took over the streets of Las Vegas has left southern Nevada for now, but could return in a few years.

At a Glance Swarms of grasshoppers descending on Las Vegas caught the imagination of the nation in July.

The swarms even showed up on weather radar and inspired drink specials.

The invasion is blamed on an exceptionally wet winter and spring.

Swarms of grasshoppers that invaded Las Vegas in July have finally disappeared, but experts say it's likely the jumping bugs will make a return visit to Sin City within the next few years.

The invasion didn't last long, but images, videos and even weather radar images of the hordes of grasshoppers posted to social media captured the nation's imagination for several weeks. The bugs even inspired grasshopper pizzas and drink specials in the city, the Las Vegas Review-Journal reported.

Exceptionally wet weather prompted pallid-winged grasshoppers to migrate north from northern Arizona. They have now all but disappeared, which comes as no surprise to entomologists.

"That’s kind of what we figured would happen is after a week, week and a half, they’d move on or die off," Jeff Knight, the state entomologist for the Nevada Department of Agriculture, told the Review-Journal on Wednesday.

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The migration of the grasshoppers was blamed on an exceptionally wet winter and spring in southern Nevada. So far this year, 4.64 inches of rain have fallen at Las Vegas' McCarran International Airport, where the annual average is 4.19 inches. The wettest month was February, when 2.05 inches fell at the airport. In fact, January through June was the fifth-wettest such period on record in Las Vegas and the third-wettest in Nevada.

National Weather Service meteorologist Caleb Steele said it's pretty common for wetter winters and springs to occur every three to four years in southern Nevada, with rainfall totals surpassing 4 inches about every five years.

And with the wetter weather come the grasshoppers.

"We have records clear from the '60s of it happening, and I have seen it ... at least four or five times in my 30-plus years ," Knight told CNN.com.

"There are some special weather conditions that trigger the migration," he added. It's believed that they are headed north in search of drier weather to lay their eggs in the fall; Heavy rain can pose a threat to the safety of the insects' eggs.

Grasshoppers pose no threat to humans or animals as they do not carry diseases or bite. They can, however, be quite a nuisance.