Flowers are not just colourful by accident: their colours, spots and patterns are often tuned to match the way their main pollinators see the world. To a hoverfly or bee, a flower can act like a signpost, advertising nectar or pollen and guiding the visitor to the right place. For the plant, that guidance increases the chance that pollen will be carried from one flower to another.Some flowers go a step further by changing colour during anthesis,…
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