I report previously undocumented “fanning: and “crash-diving” behavior of the Least Grebe (Tachybaptus dominicus). I speculate that “fanning” may be used to control egg temperature, and may be related to “rearing” and “wing-quivering” behavior known for some South American grebes. I also summarize information on nests, clutch size, and egg-covering by Least Grebes in the Lower Rio Grande Valley of south Texas.