[Mystery bird] Water Dikkop, also known as the Water Thick-knee, Burhinus vermiculatus, photographed near the Kilombero River, Tanzania, Africa. [I will identify this bird for you in 48 hours]
Nikon D300, 600 mm VR lens. ISO 320, 1/800 sec, f/7.
Please name at least one field mark that supports your identification.