Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:Taken together with studies on the function of female ornamentation (Lebas 2006; Weiss 2006; Pryke 2007; reviewed in Amundsen & Parn 2006) and song in female songbirds (Ritchison 1983; Catchpole & Slater 1995; Searcy & Yasukawa 1995; Langmore 1998), these results suggest that the processes…
Category: