Parrots have a wide range of articulations. Wild parrots do not imitate. Only pets will mimic people and noises they hear. The African gray parrots are the best mimics. Parrots have a direct, strong flight. Most species are perched or climbing tree canopies when not flying. Parrots use their bills for climbing. They grip the branches or other supports with their beaks. Parrots frequently walk with a rolling gait on the ground.