This grebe was floating on the water by itself in a fairly shallow part of the small pond at the Smith Oaks Rookery. The bill was a very obvious give away as to what species this was. I did not observe the ducking behavior while the grebe was here, probably because the water was so shallow in this area. I had seen a pair further out into the pond earlier who were ducking under the water and reemerging after about 15 or so seconds.
Sitting on shallow pond in the rain
The Pied-billed Grebe (Podilymbus podiceps) is a species of the grebe family of water birds. Since the Atitlán Grebe (Podilymbus gigas) has become extinct, it is the sole extant member of the genus Podilymbus. The Pied-billed Grebe is primarily found in ponds throughout the Americas. Other names of this grebe include American dabchick, dabchick, Carolina grebe, devil-diver, dive-dapper, dipper, hell-diver, pied-billed dabchick, thick-billed grebe, and water witch.