Fossilized pollen grains found in the stomach of a 47-miilion-year-old Pumiliornis tessellatus, a tiny bird that lived in what is now Germany during Eocene, are earliest direct evidence of flower-visiting by birds. This image shows the skeleton of Pumiliornis tessellatus from the middle Eocene; framed area indicates position of stomach contents. Image credit: Gerald Mayr / Volker Wilde. Fossil evidence for the existence of pollinating insects dates...
