Hoverflies love this fine weather we’ve had recently. It’s difficult to get a good shot when they’re hovering, but later in the afternoon they often settle for a bit of sunbathing, on a fence, or in this case by the pond.
Press keys ctrl + to see closer up.
This one conveniently turned around to give a frontal view of those big eyes.
According to Wikipedia there are thousands of species of hoverfly. Many feed on nectar and pollen, as I think these do. Others feed on aphids. They are generally beneficial in the garden.