Length (μm) of house sparrow sperm in relation to sperm sampling method controlling for relative order of faecal [17] to massage samples [19,20].

<p>Length (μm) of house sparrow sperm in relation to sperm sampling method controlling for relative order of faecal [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0182853#pone.0182853.ref017" target="_blank">17</a>] to massage samples [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0182853#pone.0182853.ref019" target="_blank">19</a>,<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0182853#pone.0182853.ref020" target="_blank">20</a>].</p>