With strong teeth, sharp as blades, gathered in groups, grasshoppers "clouds" over the fields became a terrible disaster for humans.
The locust pandemic is a worldwide problem.
Some high-class animals like pigs, cows, horses, chickens, ducks, even humans have bright red blood. There are also some species such as shrimp, crickets, grasshoppers, dragonflies . in their bodies also have blood circulating non-stop, but are transparent or have other colors.
That's because in these insects' blood there is only the blood-cell-like cell of high-class animals, which lacks red blood cells. Because there are no red blood cells, there is no hemoglobin. Therefore, the blood of these animals is not pink.
But some insects, such as the larva knife, because its plasma has some red blood cells, so its blood is also pink. There are insects with blue or yellow blood, which are due to their plasma containing yellow or green pigment and grasshopper blood blue .