The limpkin is a rather unique bird in as much as it is the only member of its family and has no close relatives among other birds. It is almost exclusively found in the USA in Florida. You can hear its call here http://www.birds.cornell.edu/AllAboutBirds/audio/Limpkin.html
The limpkins call was recorded and used as one of the jumgle sounds in the 1930's Tarzan movies