sentences:  Lacking vocal cords, birds are thought to make tones and sounds using throat muscles and membranes – the syrinx in particular.There are likely to be limitations on the sounds that birds can mimic due to differences in anatomical structures, such as their lacking lips.However, it has been suggested that mimicry amongst birds is almost ubiquitous and it is likely that eventually, all species will be shown to be able to have some ability to mimic extra-specific sounds (but not necessarily human speech).