Changes

Unlike many storks, storks are not voiceless. Croaking, squeaking and mooing sounds occur, with the addition of a beak rattle. The species of the genus ''Ciconia'' make whistling sounds, which are more pronounced with the black stork than with the white stork.  

Unlike many storks, storks are not voiceless. Croaking, squeaking and mooing sounds occur, with the addition of a beak rattle. The species of the genus ''Ciconia'' make whistling sounds, which are more pronounced with the black stork than with the white stork.  

The name has its origins in either Old English (''storc'' or ''stearc'') or Old Norse (''storkr''),  and refers to the stiff appearance of the birds when standing.<ref>http://dictionary.reference.com/browse/stork</ref><ref>http://www.merriam-webster.com/dictionary/stork</ref>

The name has its origins in either Old English (''storc'' or ''stearc'') or Old Norse (''storkr''),  and refers to the stiff appearance of the birds when standing.<ref>http://dictionary.reference.com/browse/stork</ref><ref>https://www.merriam-webster.com/dictionary/stork</ref>

===Species===

===Species===