The Gray Wall Jumper (Menemerus bivittatus) is a small spider that has a highly coordinated jumping ability with which it captures prey and move about. You normally see this spider scurrying around, or vibrating its hairy palps as it walks.
The Gray Wall Jumper is an active hunter during the day, but it spends the night hidden away in crevices or around lighted areas, where it captures those insects attracted to the lights.
This hunting spider does not spin a web to capture its prey; and is usually found on the walls of buildings or on tree trunks where it stalks its prey. The spider however, will use silk for drag lines, and for constructing egg sacs and retreats. The photos in this post are of a male Gray Wall Jumper which is longitudinally striped with alternating black and white, having an inverted “V” mark on its chellicerae.
The female, which is slightly bigger, has thin black stripes down the sides of her body.
Gray Wall Jumpers have excellent vision and are capable of stalking their prey from a relatively long distance. They are known to creep up on their target and pounce on them using their jumping ability.
I also read that their sense of sight is extraordinary for invertebrates as they can see in color, and detect different colours. Gray Wall Jumpers are harmless to humans, and they are considered to be beneficial in the control of flies, mosquitoes, and other human pests. Both young and old spiders feed mainly on small flies and moths, but they can easily capture insects that are twice their weight.I read that jumping spiders have the ability to turn and face whatever is approaching them. They will always rotate to keep their “threat” in front of them.Gray Wall Jumpers are an annual species and they live for approximately one year.