Stridulating means making a sound by rubbing body parts together, like some insects do.
Stridulating is a way that some insects talk to each other. It's a natural sound, not made by people.
Examples:
The cricket is stridulating in the grass.
I can hear the bug stridulating in the tree.
The beetle is stridulating loudly.
The ants are stridulating to each other about where to find food.
The cicada is stridulating so loudly, I can't hear anything else!
I think the grasshopper is stridulating a song for us!