Comment by philipov

The case of hybrid vigor I'm familiar with is from camels during the middle ages. One hump camels are adapted to hot desert climates, while two hump camels are adapted to cold steppe climates. This created a divide between central asia and the middle east where you would have to switch camels as you traveled. There were people who learned to crossbread the camels to create a hybrid that was stronger than either and could survive in both climates, and they began to dominate trade routes in the area. The catch was that the hybrid vigor only lasted a single generation, and if you tried to breed them again you'd get runts.