Macro photographers are well aware of the crab spider. They remain within flowers and can leave bad swell with their sting. This one belongs to the Thomisus spectabilis family of crab spiders. They change their colors and assume the color of the surrounding.
Often the crab spider remains for days, even weeks at the same spot. The front two legs, that are often larger and stronger than the other six, are held sideways, ready to catch the prey immediately. Because they sit on easily spotted places they are also easy to catch by the predators. When they spot a possible enemy they move quickly at the other site of the flower or leave. Their eyesight is excellent developed as can be seen on the picture.