Yes, sorry. But yeah, a grasshopper will, during a fertility shortage, go through a transformation and seek out a swarm of its brethren, forming what we call locusts.
They say there used to be more locusts in the US and Mexico than there were in the Sahara, but that when the Gold Rush happened, so many people passed along where the grasshoppers lived that the necessary numbers needed to make locust swarms was reduced by the constant tramplings of passerbies.