basically anywhere in a large grassy area there are alot in the summer
You would have to do time travel back about 45 years to find any Grasshopper tires today.
Millimeter
The best measurement to find the length of a grasshopper would be to use a ruler or caliper. Measure from the tip of its head to the end of its abdomen, ensuring that the grasshopper is straightened out for an accurate reading. This measurement should be taken in centimeters or millimeters for precision. It's important to handle the grasshopper gently to avoid stress or injury.
I would use grams.
If you literally mean to have a grasshopper, then it would be: Tener una saltamontes. You would have to conjugate Tener to whoever has the grasshopper.
IN THE GRASS!!!!!!!
to find a mate.
The grasshopper wouldn't be able to jump!
Exchange gases
If you go into a field you don't find one grasshopper you find none or thousand's! so for their habits I think that would be a yes.
Sometimes you will die if its poison but if its not then your safe
You have to look at what eats what. Like the grasshopper eats grass, and the bird eats the grasshopper, and so on.