“They tend to creep around the bottom of ponds and streams searching for prey. When a nymph is about to molt into an adult it crawls out of the water. Dawn or dusk during fine weather is the most common times for molting. There are usually 10 – 15 molts as nymphs. It can take nymphs from 1 to 5 years to mature depending on species.
Before mating the male must transfer sperm from the genital opening on segment 9 to the reproductive organs on segments and 3. Then on finding a female he grabs her by the neck with his claspers. She curves her body around until the tip of her abdomen touches his reproductive organs in segment 2 and 3 to collect the sperm. This is known as the copulation wheel. After mating the pair may fly in tandem with the male leading. Females mate with more than one male and store the sperm from the matings, although she tends to use the sperm from the last mating. The male mating organ contains a structure that allows him to scrape or push aside the sperm from previous matings before depositing his own in the most favorable spot.” Bumblebee