Flower colour matters

The females of this crab spider (Misumena vatia) can change their colour depending on the colour of the flower where they sit and wait for a prey. On a white flower they have a white body, on yellow flowers it is changed to an intense yellow (right, photo: Olaf Leillinger). Thus, the albiflora form of Dactylorhiza fuchsii (left, photo: Norbert Griebl) is quite a convenient place to hunt insects – the standard purple colour of this orchid would not fit her camouflage strategy. The spider changes its colour by secreting a yellow pigment into the outer cell layer of its body.While sitting on white flowers, this pigment is transported into lower layers. The colour change from white to yellow takes between 10 and 25 days, the reverse about six days.

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