Western Grebe - notice how the black cap comes down to the eye
Clarke's Grebe - notice how the white surrounds the eye, no black
Horned Grebe - notice the point on the back of the head
And finally, this Kestral eating some sort of mouse on the top of a telephone pole. There was a guy flying a 'tethered airplane' about 50 feet away from the Kestral. The plane whirling by again and again. The Kestral was completely unphased.