Texan Farmer

A Texan farmer goes to Australia for a vacation.
There he meets an Aussie farmer and gets talking.
The Aussie shows off his big wheat field and the Texan says :
- Oh! We have wheat fields that are at least twice as large.
Then they walk around the ranch a little and the Aussie shows off his herd of cattle.
The Texan immediately says :
- We have longhorns that are at least twice as large as your cows.
The conversation has, meanwhile, almost died when the Texan sees a herd of kangaroos hopping through the field. He asks :
- And what are those ?
The Aussie asks with an incredulous look :
- Don't you have any grasshoppers in Texas ?