Laridae
... that the family Laridae are the only shorebirds known to have developed ultraviolet vision?
... that the family <b id="mwAik"><a href="./Laridae" id="mwAio" rel="mw:WikiLink" title="Laridae">Laridae</a></b> <i id="mwAis">(European herring gull pictured)</i> are the only <a href="./Charadriiformes" id="mwAiw" rel="mw:WikiLink" title="Charadriiformes">shorebirds</a> known to have developed ultraviolet vision?