The Basiaeschna janata , for example, is suddenly very common in the spring, but disappears a few weeks later and is not seen again until the following year.
Red-veined darters flying "in cop" male ahead Dragonflies are powerful and agile fliers, capable of across the sea, moving in any direction, and changing direction suddenly.
This behaviour involves doing a "", perching with the body raised and the abdomen pointing towards the sun, thus minimising the amount of solar radiation received.
The second and third segments are enlarged, and in males, on the underside of the second segment has a cleft, forming the secondary genitalia consisting of the , hamule, genital lobe, and penis.