Pie-billed grebes are not strong fliers. They are much more likely to dive under the water than they are to fly away if danger approaches.When the dive under the water they often do so by sinking straight down, much like a submarine, with their head being the last thing to submerge. Under the water they are excellent swimmers. They are able to trap water in their feathers to help control their buoyancy.
Young pied-billed grebes usually leave the nest a day after they hatch. While they are able to swim almost immediately they typically spend most of their first week riding on one of their parents back. Immature grebes are easily identified by the striking feather patterns on their face.