South double-collared sunbird male sucking nectar from Chasmanthe aethiopica flower, Notice how the anthers of the flower rub against the crown of the bird and the accumulation of pollen on the crown. Note also the stigma picking up pollen from the crown.

Another male with the anthers of the flower rubbing against the head and depositing pollen. Style is visible but tip of stigma is hidden by anther. The two photos below are part of the same sequence.

See first photo in sequence, above right. Male changes position so that anthers are no longer rubbing on the head and the stigma is now visible.

Close-up of the photo on the left - pollen is visible on the tip of the stigma. The stigma is sticky and some of the pollen on the head would have adhered to it when it was rubbing against the head.

In this photograph, the two-prong stigma and the style can be seen clearly.