Black-bellied Plover, Pluvialis equatarola

The birds above and below show the black axillaries (armpits) that are a distinguishing mark of Black-bellied Plovers.

The pervasive sharp white notches on the dark feathers of the upperparts, and the strong streaking of the breast of the bird on the left indicates a juvenile rather than a winter plumage adult.

The not-very-good picture on the left shows the bird well along in the process of molting into its beautiful breeding plumage; the picture above shows a female in breeding plumage from the rear, alongside a juvenile.