As said, the Secretary Bird eats mainly snakes, but it can also eat other kind of reptiles, insects, eggs and even small mammals. I saw this one eating a poor lizard that doesn't seem to realize that it is living the last seconds of its life... We can see the nictitating membrane of the eye that is closed when the bird ingurgitates a prey.
Another close portrait of this bird that I find particularly photogenic.
A younger individual, with its browner plumage, not yet completely grey, and with paler eyes.
All pictures were taken at Etosha National Park in July 2018.